Alex O'Brien|  O'Brien in 2018 | 
| Country (sports) | .png) United States | 
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| Residence | Amarillo, Texas, United States | 
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| Born | (1970-03-07) March 7, 1970 Amarillo, Texas, United States
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| Height | 1.85 m (6 ft 1 in) | 
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| Turned pro | 1992 | 
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| Retired | 2003 | 
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| Plays | Right-handed (two-handed backhand) | 
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| College | Stanford University | 
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| Prize money | $3,526,390 | 
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| Career record | 93–136 | 
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| Career titles | 1 | 
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| Highest ranking | No. 30 (21 July 1997) | 
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| Australian Open | 2R (1995, 1998) | 
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| French Open | 2R (1993, 1994) | 
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| Wimbledon | 3R (1997) | 
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| US Open | 3R (1996) | 
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| Career record | 277–185 | 
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| Career titles | 13 | 
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| Highest ranking | No. 1 (8 May 2000) | 
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| Australian Open | F (1996, 1997) | 
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| French Open | 3R (1996) | 
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| Wimbledon | QF (1999, 2000) | 
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| US Open | W (1999) | 
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| Tour Finals | W (1999) | 
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| Olympic Games | 2R (2000) | 
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| Australian Open | 2R (1996) | 
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| Wimbledon | 2R (1997, 1998) | 
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| US Open | 1R (2001) | 
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| Last updated on: 31 December 2022. | 
 Alex O'Brien (born (1970-03-07)March 7, 1970) is an American former doubles world No. 1 tennis player. He gained the top ranking in May 2000 and was ranked as high as world No. 30 in singles in June 1997. He won the men's doubles at the 1999 US Open with partner Sébastien Lareau. 
  Tennis career
 O'Brien won his only singles title at New Haven, Connecticut in 1996 and reached the quarterfinals of the 1994 Cincinnati Masters and the 1996 Canada Masters. 
He won 13 doubles titles, including one Grand Slam tournament, the 1999 US Open,[1] and the season-ending 1999 ATP Doubles Championships,[2] both partnering Sébastien Lareau. The pair were also finalists at the 1996 Australian Open and 1997 Australian Open. 
O'Brien played on the United States Davis Cup team, competed in the 2000 Sydney Olympics, and was a four-time All-American at Stanford University, where he won NCAA singles, doubles, and team titles in 1992. He earned a bachelor's degree in American Studies at Stanford in 1992. 
 After tennis
  Following his tennis career, O'Brien founded an online business which markets and distributes steaks. The O'Brien family has been in the beef business for 60 years basing their production out of the LIT Ranch.  O'Brien is currently President and part owner of the Bank of Commerce, a small community online bank with branches in Amarillo and McLean Texas. 
 Grand Slam finals
 Doubles (1 title, 3 runners-ups)
  ATP career finals
 Singles: 1 (1 title)
    |   | Legend |   | Grand Slam Tournaments (0–0) |   | ATP World Tour Finals (0–0) |   | ATP Masters Series (0–0) |   | ATP Championship Series (1–0) |   | ATP World Series (0–0) |  |   | Finals by surface |   | Hard (1–0) |   | Clay (0–0) |   | Grass (0–0) |   | Carpet (0–0) |  |   | Finals by setting |   | Outdoors (1–0) |   | Indoors (0–0) |  | 
  Doubles: 33 (13 titles, 20 runner-ups)
    |   | Legend |   | Grand Slam Tournaments (1–3) |   | ATP World Tour Finals (1–1) |   | ATP Masters Series (4–3) |   | ATP Championship Series (2–4) |   | ATP World Series (5–9) |  |   | Finals by surface |   | Hard (10–14) |   | Clay (0–4) |   | Grass (1–1) |   | Carpet (2–1) |  |   | Finals by setting |   | Outdoors (8–16) |   | Indoors (5–4) |  | 
   | Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score | 
  | Loss | 0–1 | Jan 1994 | Oahu, United States | World Series | Hard |  Jonathan Stark |  Tom Nijssen 
  Cyril Suk | 4–6, 4–6 | 
  | Loss | 0–2 | Feb 1994 | Scottsdale, United States | World Series | Hard | .svg.png) Sandon Stolle |  Jan Apell 
  Ken Flach | 0–6, 4–6 | 
  | Win | 1–2 | Aug 1994 | Cincinnati, United States | Masters Series | Hard | .svg.png) Sandon Stolle |  Wayne Ferreira 
 .svg.png) Mark Kratzmann | 6–7, 6–3, 6–2 | 
  | Loss | 1–3 | Feb 1995 | San Jose, United States | World Series | Hard | .svg.png) Sandon Stolle |  Jim Grabb 
  Patrick McEnroe | 6–3, 5–7, 0–6 | 
  | Loss | 1–4 | May 1995 | Pinehurst, United States | World Series | Clay | .svg.png) Sandon Stolle | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 2–6, 4–6 | 
  | Loss | 1–5 | Sep 1995 | New York, United States | Grand Slam | Hard | .svg.png) Sandon Stolle | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 3–6, 3–6 | 
  | Loss | 1–6 | Jan 1996 | Melbourne, Australia | Grand Slam | Hard | .svg.png) Sébastien Lareau |  Stefan Edberg 
  Petr Korda | 5–7, 5–7, 6–4, 1–6 | 
  | Loss | 1–7 | Jun 1996 | Queen's, United Kingdom | World Series | Grass | .svg.png) Sébastien Lareau | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 3–6, 6–7(3–7) | 
  | Win | 2–7 | Oct 1996 | Stuttgart, Germany | Masters Series | Hard | .svg.png) Sébastien Lareau |  Jacco Eltingh 
  Paul Haarhuis | 3–6, 6–4, 6–3 | 
  | Loss | 2–8 | Nov 1996 | Hartford, United States | ATP Finals | Carpet | .svg.png) Sébastien Lareau | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 4–6, 7–5, 2–6, 6–7(3–7) | 
  | Loss | 2–9 | Jan 1997 | Melbourne, Australia | Grand Slam | Hard | .svg.png) Sébastien Lareau | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 6–4, 5–7, 5–7, 3–6 | 
  | Win | 3–9 | Mar 1997 | Philadelphia, United States | Championship Series | Hard | .svg.png) Sébastien Lareau |  Ellis Ferreira 
  Patrick Galbraith | 6–3, 6–3 | 
  | Loss | 3–10 | Apr 1997 | Orlando, United States | World Series | Clay |  Jeff Salzenstein |  Mark Merklein 
  Vince Spadea | 4–6, 6–4, 4–6 | 
  | Loss | 3–11 | May 1997 | Rome, Italy | Masters Series | Clay |  Byron Black |  Mark Knowles 
 .svg.png) Daniel Nestor | 3–6, 6–4, 5–7 | 
  | Win | 4–11 | Jul 1997 | Los Angeles, United States | World Series | Hard | .svg.png) Sébastien Lareau |  Mahesh Bhupathi 
  Rick Leach | 7–6, 6–4 | 
  | Loss | 4–12 | Aug 1997 | Montreal, Canada | Masters Series | Hard | .svg.png) Sébastien Lareau |  Mahesh Bhupathi 
  Leander Paes | 6–7, 3–6 | 
  | Loss | 4–13 | Aug 1997 | New Haven, United States | Championship Series | Hard | .svg.png) Sébastien Lareau |  Mahesh Bhupathi 
  Leander Paes | 4–6, 7–6, 2–6 | 
  | Loss | 4–14 | Oct 1997 | Beijing, China | World Series | Hard |  Jim Courier |  Mahesh Bhupathi 
  Leander Paes | 5–7, 6–7 | 
  | Loss | 4–15 | Mar 1998 | Miami, United States | Masters Series | Hard |  Jonathan Stark |  Ellis Ferreira 
  Rick Leach | 2–6, 4–6 | 
  | Win | 5–15 | Apr 1998 | Hong Kong, Hong Kong | International Series | Hard |  Byron Black |  Neville Godwin 
  Tuomas Ketola | 7–5, 6–1 | 
  | Loss | 5–16 | May 1998 | Atlanta, United States | World Series | Clay |  Richey Reneberg |  Ellis Ferreira 
  Brent Haygarth | 3–6, 6–0, 2–6 | 
  | Loss | 5–17 | Aug 1998 | New Haven, United States | Championship Series | Hard | .svg.png) Sébastien Lareau | .svg.png) Wayne Arthurs 
 .svg.png) Peter Tramacchi | 6–7, 6–1, 3–6 | 
  | Win | 6–17 | Nov 1998 | Stuttgart, Germany | Masters Series | Hard | .svg.png) Sébastien Lareau |  Mahesh Bhupathi 
  Leander Paes | 6–3, 3–6, 7–5 | 
  | Win | 7–17 | Jan 1999 | Doha, Qatar | World Series | Hard |  Jared Palmer |  Piet Norval 
  Kevin Ullyett | 6–3, 6–4 | 
  | Loss | 7–18 | Feb 1999 | Memphis, United States | Championship Series | Hard | .svg.png) Sébastien Lareau | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 3–6, 4–6 | 
  | Win | 8–18 | Jun 1999 | Queen's, United Kingdom | World Series | Grass | .svg.png) Sébastien Lareau | .svg.png) Todd Woodbridge 
 .svg.png) Mark Woodforde | 6–3, 7–6(7–3) | 
  | Win | 9–18 | Sep 1999 | New York, United States | Grand Slam | Hard | .svg.png) Sébastien Lareau |  Mahesh Bhupathi 
  Leander Paes | 7–6(9–7), 6–4 | 
  | Win | 10–18 | Nov 1999 | Paris, France | Masters Series | Carpet | .svg.png) Sébastien Lareau |  Paul Haarhuis 
  Jared Palmer | 7–6(9–7), 7–5 | 
  | Win | 11–18 | Nov 1999 | Hartford, United States | ATP Finals | Carpet | .svg.png) Sébastien Lareau |  Mahesh Bhupathi 
  Leander Paes | 6–3, 6–2, 6–2 | 
  | Loss | 11–19 | Jan 2000 | Doha, Qatar | International Series | Hard |  Jared Palmer |  Mark Knowles 
  Max Mirnyi | 3–6, 4–6 | 
  | Win | 12–19 | Mar 2000 | Indian Wells, United States | Masters Series | Hard |  Jared Palmer |  Paul Haarhuis 
 .svg.png) Sandon Stolle | 6–4, 7–6(7–5) | 
  | Win | 13–19 | Aug 2000 | Washington, United States | Championship Series | Hard |  Jared Palmer |  Andre Agassi 
  Sargis Sargsian | 7–5, 6–1 | 
  | Loss | 13–20 | Feb 2001 | Memphis, United States | Championship Series | Hard |  Jonathan Stark |  Bob Bryan 
  Mike Bryan | 3–6, 6–7(3–7) | 
 ATP Challenger and ITF Futures finals
 Singles: 9 (5–4)
    |   | Legend |   | ATP Challenger (5–4) |   | ITF Futures (0–0) |  |   | Finals by surface |   | Hard (5–4) |   | Clay (0–0) |   | Grass (0–0) |   | Carpet (0–0) |  | 
   | Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score | 
  | Win | 1–0 | Jul 1991 | New Haven, United States | Challenger | Hard |  Stephane Simian | 6–4, 6–4 | 
  | Win | 2–0 | Jul 1992 | Aptos, United States | Challenger | Hard |  Byron Black | 6–4, 2–6, 6–1 | 
  | Loss | 2–1 | Sep 1992 | Fairfield, United States | Challenger | Hard |  Jared Palmer | 6–7, 2–6 | 
  | Win | 3–1 | Oct 1992 | Monterrey, Mexico | Challenger | Hard |  Jared Palmer | 6–2, 6–4 | 
  | Loss | 3–2 | Oct 1993 | Caracas, Venezuela | Challenger | Hard |  Mauricio Hadad | 5–7, 4–6 | 
  | Loss | 3–3 | Oct 1996 | Monterrey, Mexico | Challenger | Hard |  Kevin Ullyett | 3–6, 6–7 | 
  | Win | 4–3 | Feb 1998 | West Bloomfield, United States | Challenger | Hard | .svg.png) Grant Doyle | 4–6, 6–3, 6–4 | 
  | Win | 5–3 | Jul 1999 | Winnetka, United States | Challenger | Hard |  Max Mirnyi | 6–2, 6–2 | 
  | Loss | 5–4 | Dec 1999 | Burbank, United States | Challenger | Hard |  Cecil Mamiit | 5–7, 3–6 | 
 Doubles: 7 (5–2)
    |   | Legend |   | ATP Challenger (5–2) |   | ITF Futures (0–0) |  |   | Finals by surface |   | Hard (5–1) |   | Clay (0–1) |   | Grass (0–0) |   | Carpet (0–0) |  | 
   | Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score | 
  | Win | 1–0 | Jul 1992 | Aptos, United States | Challenger | Hard |  Paul Annacone |  Miguel Nido 
  Peter Nyborg | 6–4, 4–6, 7–5 | 
  | Win | 2–0 | Oct 1992 | Monterrey, Mexico | Challenger | Hard |  Mark Knowles |  Richard Matuszewski 
  John Sullivan | 3–6, 6–3, 7–6 | 
  | Loss | 2–1 | Dec 1992 | Naples, United States | Challenger | Clay |  Mark Knowles |  Todd Nelson 
  Tobias Svantesson | 6–2, 3–6, 4–6 | 
  | Win | 3–1 | Sep 1993 | Fairfield, United States | Challenger | Hard |  Jared Palmer |  Matt Lucena 
  Brian Macphie | 6–3, 7–5 | 
  | Loss | 3–2 | Oct 1993 | Caracas, Venezuela | Challenger | Hard |  Mark Knowles |  Maurice Ruah 
  Laurence Tieleman | 7–5, 4–6, 6–7 | 
  | Win | 4–2 | Jun 1994 | Annenheim, Austria | Challenger | Hard |  Jim Grabb |  Diego Nargiso 
  Gianluca Pozzi | walkover | 
  | Win | 5–2 | Jul 1994 | Aptos, United States | Challenger | Hard |  Brian Macphie |  Donny Isaak 
  Michael Roberts | 6–2, 7–6 | 
   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
  References
  External links
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|  Current ATP world No. 1 in bold, as of week of 18 August 2025ATP rankings was introduced on 1 March 1976
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| 51–55 |  | 
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| 56–60 |  | 
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| 61–65 |  | 
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| 66–70 |  | 
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|  (year first held/year last held – number of weeks (w))weeks record underlined.
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