Lucas Arnold Ker| Country (sports) |  Argentina | 
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| Residence | Barcelona, Spain | 
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| Born | (1974-10-12) 12 October 1974 Buenos Aires, Argentina
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| Height | 1.80 m (5 ft 11 in) | 
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| Turned pro | 1994 | 
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| Retired | 2016 | 
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| Plays | Right-handed | 
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| Prize money | US$ 1,745,936 | 
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| Career record | 22–31 | 
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| Career titles | 0 2 Challenger, 0 Futures
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| Highest ranking | No. 77 (20 July 1998) | 
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| Australian Open | 1R (1998, 1999) | 
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| French Open | 2R (1998) | 
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| Wimbledon | 1R (1998) | 
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| US Open | 3R (1998) | 
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| Career record | 299–258 | 
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| Career titles | 15 19 Challenger, 1 Futures
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| Highest ranking | No. 21 (8 March 2004) | 
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| Australian Open | 3R (1999, 2002, 2008, 2009) | 
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| French Open | SF (1997) | 
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| Wimbledon | 3R (2001) | 
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| US Open | 3R (2003) | 
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| Australian Open | 2R (2002, 2004) | 
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| French Open | QF (2004) | 
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| Wimbledon | 2R (2001, 2004, 2005, 2009) | 
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| US Open | 2R (2001) | 
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| Last updated on: 7 August 2021. | 
 Lucas Arnold Ker (Spanish pronunciation: [ˈlukas aɾˈnol ˈkeɾ];[1] born 12 October 1974) is an Argentine former professional tennis player. 
Arnold Ker started playing tennis in the Olivos Tenis Club of Buenos Aires, under coach Malcolm Campbell. He is the younger brother of Patricio Arnold. He is right-handed and turned professional in 1994. He played several times for the Argentine Davis Cup team, where he made his debut in 1997 against Venezuela. Arnold Ker was Roger Federer's opponent in the latter's first professional match in 1998, beating the 17-year-old future singles world No. 1 and 20-time major singles champion in straight sets. Arnold Ker retired from professional tennis in 2016. 
  Cancer
 In August 2006, he was diagnosed with testicular cancer. The testicle was removed, and he successfully underwent chemotherapy. In 2008, he was in remission and returned to playing professional tennis.[2] 
 ATP Tour career finals
 Doubles: 33 (15 titles, 18 runner-ups)
    |   | Legend |   | Grand Slam tournaments (0–0) |   | ATP World Tour Finals (0–0) |   | ATP World Tour Masters 1000 (0–0) |   | ATP World Tour 500 Series (0–5) |   | ATP World Tour 250 Series (15–13) |  |   | Titles by surface |   | Hard (0–1) |   | Clay (15–15) |   | Grass (0–0) |   | Carpet (0–2) |  |   | Titles by setting |   | Outdoor (15–16) |   | Indoor (0–2) |  | 
   | Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score | 
  | Win | 1–0 | Aug 1996 | San Marino, San Marino | World Series | Clay |  Pablo Albano |  Mariano Hood 
  Sebastián Prieto | 6–1, 6–3 | 
  | Loss | 1–1 | Oct 1996 | Valencia Open, Spain | World Series | Clay |  Pablo Albano | .svg.png) Lucas Arnold 
  Jack Waite | 7–6, 3–6, 4–6 | 
  | Win | 2–1 | Jun 1999 | Merano Open, Italy | World Series | Clay |  Jaime Oncins |  Marc-Kevin Goellner 
  Eric Taino | 6–4, 7–6(7–1) | 
  | Win | 3–1 | Aug 1999 | San Marino, San Marino | World Series | Clay |  Mariano Hood |  Petr Pála 
  Pavel Vízner | 6–3, 6–2 | 
  | Win | 4–1 | Sep 1999 | Majorca Open, Spain | World Series | Clay |  Tomás Carbonell |  Alberto Berasategui 
  Francisco Roig | 6–1, 6–4 | 
  | Win | 5–1 | Oct 1999 | Bucharest, Romania | World Series | Clay |  Martín García |  Marc-Kevin Goellner 
  Francisco Montana | 6–3, 2–6, 6–3 | 
  | Loss | 5–2 | Feb 2000 | Pacific Coast Championships, United States | World Series | Hard |  Eric Taino |  Jan-Michael Gambill 
  Scott Humphries | 1–6, 4–6 | 
  | Win | 6–2 | Mar 2000 | Bogotá, Colombia | International Series | Clay |  Pablo Albano |  Joan Balcells 
  Mauricio Hadad | 7-6(7–4), 1–6, 6–2 | 
  | Loss | 6–3 | Jul 2000 | Stuttgart Open, Germany | International Gold | Clay |  Donald Johnson |  Jiří Novák 
  David Rikl | 7–5, 2–6, 3–6 | 
  | Win | 7–3 | Feb 2001 | Movistar Open, Chile | International Series | Clay |  Tomás Carbonell |  Mariano Hood 
  Sebastián Prieto | 6–4, 2–6, 6–3 | 
  | Win | 8–3 | Feb 2001 | Buenos Aires, Argentina | International Series | Clay |  Tomás Carbonell |  Mariano Hood 
  Sebastián Prieto | 5–7, 7–5, 7–6(7–5) | 
  | Loss | 8–4 | Feb 2002 | Movistar Open, Chile | International Series | Clay |  Luis Lobo |  Gastón Etlis 
  Martín Rodríguez | 3–6, 4–6 | 
  | Loss | 8–5 | Apr 2002 | Barcelona, Spain | International Gold | Clay |  Gastón Etlis | .svg.png) Michael Hill 
  Daniel Vacek | 4–6, 4–6 | 
  | Loss | 8–6 | Jul 2002 | Kitzbühel, Austria | International Gold | Clay |  Àlex Corretja |  Robbie Koenig 
  Thomas Shimada | 6–7(3–7), 4–6 | 
  | Win | 9–6 | Sep 2002 | Palermo, Italy | International Series | Clay |  Luis Lobo |  František Čermák 
  Leoš Friedl | 6–4, 4–6, 6–2 | 
  | Loss | 9–7 | Feb 2003 | Buenos Aires, Argentina | International Series | Clay |  David Nalbandian |  Mariano Hood 
  Sebastián Prieto | 2–6, 2–6 | 
  | Loss | 9–8 | Apr 2003 | Estoril, Portugal | International Series | Clay |  Mariano Hood |  Mahesh Bhupathi 
  Max Mirnyi | 1–6, 2–6 | 
  | Win | 10–8 | May 2003 | Valencia, Spain | International Series | Clay |  Mariano Hood |  Brian MacPhie 
 .svg.png) Nenad Zimonjić | 6–1, 6–7(7–9), 6-4 | 
  | Loss | 10–9 | Jul 2003 | Båstad, Sweden | International Series | Clay |  Mariano Hood |  Simon Aspelin 
  Massimo Bertolini | 7–6(7–3), 0–6, 4–6 | 
  | Win | 11–9 | Sep 2003 | Palermo, Italy | International Series | Clay |  Mariano Hood |  František Čermák 
  Leoš Friedl | 7-6(8–6), 6–7(3–7), 6–3 | 
  | Loss | 11–10 | Oct 2003 | Swiss Indoors, Switzerland | International Series | Carpet |  Mariano Hood |  Mark Knowles 
 .svg.png) Daniel Nestor | 4–6, 2–6 | 
  | Win | 12–10 | Feb 2004 | Buenos Aires, Argentina | International Series | Clay |  Mariano Hood |  Federico Browne 
  Diego Veronelli | 7–5, 6–7(2–7), 6–4 | 
  | Loss | 12–11 | Jul 2003 | Kitzbühel, Austria | International Gold | Clay |  Martín García |  František Čermák 
  Leoš Friedl | 3–6, 5–7 | 
  | Win | 13–11 | Sep 2004 | Bucharest, Romania | International Series | Clay |  Mariano Hood |  José Acasuso 
  Óscar Hernández | 7–6(7–5), 6–1 | 
  | Win | 14–11 | Oct 2004 | Palermo, Italy | International Series | Clay |  Mariano Hood |  Gastón Etlis 
  Martín Rodríguez | 7–5, 6–2 | 
  | Loss | 14–12 | Oct 2004 | Swiss Indoors, Switzerland | International Series | Carpet |  Mariano Hood |  Bob Bryan 
  Mike Bryan | 6–7(9–11), 2–6 | 
  | Loss | 14–13 | Apr 2005 | Valencia, Spain | International Series | Clay |  Mariano Hood |  Fernando González 
  Martín Rodríguez | 4–6, 4–6 | 
  | Win | 15–13 | May 2005 | Sankt Pölten, Austria | International Series | Clay | .svg.png) Paul Hanley |  Martin Damm 
  Mariano Hood | 6–3, 6–4 | 
  | Loss | 15–14 | Aug 2005 | Sopot, Poland | International Series | Clay |  Sebastián Prieto |  Mariusz Fyrstenberg 
  Marcin Matkowski | 6–7(7–9), 4–6 | 
  | Loss | 15–15 | Apr 2006 | Estoril, Portugal | International Series | Clay |  Leoš Friedl |  Lukáš Dlouhý 
  Pavel Vízner | 3–6, 1–6 | 
  | Loss | 15–16 | Jul 2006 | Amersfoort, Netherlands | International Series | Clay |  Christopher Kas |  Alberto Martín 
  Fernando Vicente | 4–6, 3–6 | 
  | Loss | 15–17 | Jul 2008 | Kitzbühel, Austria | International Gold | Clay | .svg.png) Olivier Rochus |  James Cerretani 
  Victor Hănescu | 3–6, 5–7 | 
  | Loss | 15–18 | Feb 2009 | Brasil Open, Brazil | 250 Series | Clay |  Juan Mónaco |  Marcel Granollers 
  Tommy Robredo | 4–6, 5–7 | 
 ATP Challenger and ITF Futures finals
 Singles: 5 (2–3)
    |   | Legend |   | ATP Challenger (2–3) |   | ITF Futures (0–0) |  |   | Finals by surface |   | Hard (0–0) |   | Clay (2–3) |   | Grass (0–0) |   | Carpet (0–0) |  | 
   | Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score | 
  | Loss | 0–1 | Aug 1996 | Merano, Italy | Challenger | Clay |  Juan-Albert Viloca-Puig | 6–7, 4–6 | 
  | Win | 1–1 | Aug 1997 | Merano, Italy | Challenger | Clay |  Vincenzo Santopadre | 6–1, 6–4 | 
  | Win | 2–1 | Sep 1997 | São Paulo, Brazil | Challenger | Clay |  Fernando Meligeni | 6–4, 1–0 ret. | 
  | Loss | 2–2 | Apr 1998 | Paget, Bermuda | Challenger | Clay |  Hernán Gumy | 6–7, 6–4, 2–6 | 
  | Loss | 2–3 | Jun 1998 | Braunschweig, Germany | Challenger | Clay |  Franco Squillari | 2–6, 6–4, 1–6 | 
 Doubles: 28 (20–8)
    |   | Legend |   | ATP Challenger (19–7) |   | ITF Futures (1–1) |  |   | Finals by surface |   | Hard (1–1) |   | Clay (19–7) |   | Grass (0–0) |   | Carpet (0–0) |  | 
   | Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score | 
  | Win | 1–0 | Jan 1994 | Mar del Plata, Argentina | Challenger | Clay |  Patricio Arnold |  Filippo Messori 
  Federico Mordegan | 6–4, 7–5 | 
  | Win | 2–0 | May 1994 | Bogotá, Colombia | Challenger | Clay |  Pablo Campana |  Danilo Marcelino 
 .svg.png) Nuno Marques | 3–6, 7–6, 7–6 | 
  | Loss | 2–1 | Mar 1995 | Punta Del Este, Uruguay | Challenger | Clay |  Pablo Albano |  Christian Miniussi 
  Diego Pérez | 6–4, 5–7, 1–6 | 
  | Win | 3–1 | Jul 1995 | São Paulo, Brazil | Challenger | Hard |  Pablo Albano |  Otavio Della 
  Marcelo Saliola | 6–2, 4–6, 6–1 | 
  | Win | 4–1 | May 1996 | Ljubljana, Slovenia | Challenger | Clay |  Pablo Albano |  Rikard Bergh 
  Shelby Cannon | 6–1, 3–6, 6–1 | 
  | Loss | 4–2 | Jun 1996 | Cali, Colombia | Challenger | Clay |  Patricio Arnold |  Brett Hansen-Dent 
  T J Middleton | 4–6, 3–6 | 
  | Win | 5–2 | Jul 1996 | Ostend, Belgium | Challenger | Clay |  David Škoch | .svg.png) Wim Neefs 
 .svg.png) Yuri Soberon | 7–6, 6–1 | 
  | Loss | 5–3 | Apr 1997 | Paget, Bermuda | Challenger | Clay |  Daniel Orsanic |  Mark Knowles 
  Javier Frana | 3–6, 7–6, 3–6 | 
  | Win | 6–3 | May 1997 | Ljubljana, Slovenia | Challenger | Clay |  Daniel Orsanic |  David Škoch 
  Fernon Wibier | 6–0, 6–4 | 
  | Win | 7–3 | Aug 1997 | Graz, Austria | Challenger | Clay | .svg.png) Tom Vanhoudt |  Alberto Martín 
  Albert Portas | 6–1, 6–2 | 
  | Win | 8–3 | Oct 1997 | Santiago, Chile | Challenger | Clay |  Jaime Oncins |  Diego del Río 
  Mariano Puerta | 6–2, 6–2 | 
  | Win | 9–3 | Nov 1997 | Palmar, Puerto Rico | Challenger | Clay |  Daniel Orsanic |  Mariano Hood 
  Sebastián Prieto | 7–5, 3–6, 6–3 | 
  | Win | 10–3 | Feb 1999 | Punta Del Este, Uruguay | Challenger | Clay |  Marcelo Filippini |  Paulo Carvallo 
  Gonzalo Rodríguez | 6–1, 6–4 | 
  | Loss | 10–4 | Mar 1999 | Salinas, Ecuador | Challenger | Hard |  Daniel Orsanic |  Mariano Hood 
  Sebastián Prieto | 2–6, 6–7 | 
  | Win | 11–4 | Nov 2000 | Montevideo, Uruguay | Challenger | Clay |  Gastón Etlis |  Joan Balcells 
  Germán Puentes | 6–4, 6–4 | 
  | Win | 12–4 | Nov 2000 | Buenos Aires, Argentina | Challenger | Clay |  Pablo Albano |  Sergio Roitman 
  Andrés Schneiter | 6–3, 4–6, 6–2 | 
  | Win | 13–4 | May 2003 | Zagreb, Croatia | Challenger | Clay |  Mariano Hood |  Simon Aspelin 
 .svg.png) Todd Perry | 6–1, 6–3 | 
  | Win | 14–4 | Jul 2003 | Košice, Slovakia | Challenger | Clay |  Mariano Hood |  Rubén Ramírez Hidalgo 
  Salvador Navarro | 2–1 ret. | 
  | Win | 15–4 | Sep 2004 | Szczecin, Poland | Challenger | Clay |  Mariano Hood |  Óscar Hernández 
  Alberto Martín | 6–0, 6–4 | 
  | Loss | 15–5 | Sep 2005 | Argentina F12, Buenos Aires | Futures | Clay |  Diego Cristin |  Emiliano Massa 
  Leonardo Mayer | 6–7(4–7), 3–6 | 
  | Loss | 15–6 | Oct 2005 | Santiago, Chile | Challenger | Clay |  Giovanni Lapentti |  Daniel Köllerer 
  Oliver Marach | 4–6, 3–6 | 
  | Win | 16–6 | Nov 2005 | Buenos Aires, Argentina | Challenger | Clay |  Sebastián Prieto |  Rubén Ramírez Hidalgo 
  Santiago Ventura | 6–0, 6–4 | 
  | Win | 17–6 | Jul 2006 | Biella, Italy | Challenger | Clay |  Agustín Calleri |  Juan Martín del Potro 
  Martín Vassallo Argüello | 7–6(7–5), 6–2 | 
  | Win | 18–6 | Oct 2007 | Argentina F18, Tandil | Futures | Clay |  Lionel Noviski |  Máximo González 
  Diego Junqueira | 6–3, 6–2 | 
  | Win | 19–6 | Jul 2009 | Scheveningen, Netherlands | Challenger | Clay |  Máximo González |  Thomas Schoorel 
  Nick van der Meer | 7–5, 6–2 | 
  | Win | 20–6 | Aug 2009 | San Marino, San Marino | Challenger | Clay |  Sebastián Prieto |  Johan Brunström 
 .svg.png) Jean-Julien Rojer | 7–6(7–4), 2–6, [10–7] | 
  | Loss | 20–7 | Oct 2009 | Buenos Aires, Argentina | Challenger | Clay |  Máximo González |  Brian Dabul 
  Sergio Roitman | 7–6(7–4), 0–6, [8–10] | 
  | Loss | 20–8 | Nov 2015 | Buenos Aires, Argentina | Challenger | Clay |  Guido Andreozzi |  Horacio Zeballos 
  Julio Peralta | 2–6, 5–7 | 
   Key   | W | F | SF | QF | #R | RR | Q# | DNQ | A | NH | 
 (W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent;  (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record. 
 Singles
  Doubles
  Mixed doubles
  References
  External links