| Nielsen Pro Tennis Championship | 
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| Event name | Winnetka | 
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| Location | Winnetka, Illinois, USA | 
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| Venue | A. C. Nielsen Tennis Center (a facility of the Winnetka Park District) | 
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| Category | ATP Challenger Tour | 
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| Surface | Hard, outdoors | 
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| Draw | 32S/4Q/16D | 
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| Prize money | $75,000 | 
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 The Nielsen Pro Tennis Championship is a tennis tournament held intermittently in Winnetka, Illinois, USA since 1984. The event is part of the ATP Challenger Tour and is played on outdoor hard courts at the A. C. Nielsen Tennis Center, a facility owned and operated by the Winnetka Park District. 
  Past finals
 Singles
    | Year  |  Champion  |  Runner-up  |  Score  | 
  | 1984 |    Marc Flur |    Mike Leach |  6–3, 6–4  | 
  | 1985 |    Barry Moir |    Harold Solomon |  2–6, 7–5, 6–2  | 
  | 1986 |  not held  | 
  | 1987 |    Simon Youl |    Roberto Saad |  5–7, 7–6, 6–3  | 
  | 1988 |    Jeff Tarango |    Gianluca Pozzi |  7–5, 5–7, 6–2  | 
  | 1989 |    Brian Garrow |    Todd Martin |  6–4, 6–2  | 
  | 1990 |    Cristiano Caratti |    Chris Garner |  7–6, 6–1  | 
  | 1991 |    Byron Black |    Todd Martin |  6–4, 4–6, 6–2  | 
  | 1992 |    Chuck Adams |    Steve Bryan |  6–4, 6–4  | 
  | 1993 |    Kevin Ullyett |    Maurice Ruah |  6–3, 6–2  | 
  | 1994 |    Vince Spadea |    Cristiano Caratti |  6–1, 4–6, 7–5  | 
  | 1995-96 |  not held  | 
  | 1997 |    Gianluca Pozzi |    Wayne Black |  6–4, 6–2  | 
  | 1998 |    Geoff Grant |    Diego Nargiso |  5–7, 6–3, 7–5  | 
  | 1999 |    Alex O'Brien |    Max Mirnyi |  6–2, 6–2  | 
  | 2000 |    Takao Suzuki |    Yoon Yong-Il |  6–2, 6–4  | 
  | 2001-05 |  not held  | 
  | 2006 |    Sam Querrey |    Andrea Stoppini |  6–2, 6–3  | 
  | 2007 |    Noam Okun |    Kevin Anderson |  6–4, 6–3  | 
  | 2008 |    Rajeev Ram |    Scoville Jenkins |  7–5, 6–4  | 
  | 2009 |    Alex Kuznetsov |    Tim Smyczek |  6–4, 7–6(1)  | 
  | 2010 |    Brian Dabul |    Tim Smyczek |  6–1, 1–6, 6–1  | 
  | 2011 |    James Blake |    Bobby Reynolds |  6–3, 6–1  | 
  | 2012 |    John-Patrick Smith |    Ričardas Berankis |  3–6, 6–3, 7–6(7–3)  | 
  | 2013 |    Jack Sock |    Bradley Klahn |  6–4, 6–2[1]  | 
  | 2014 |    Denis Kudla |    Farrukh Dustov |  6–2, 6–2[2]  | 
  | 2015 |    Somdev Devvarman |    Daniel Nguyen |  7–5, 4–6, 7–6(7–5)  | 
  | 2016 |    Yoshihito Nishioka |    Frances Tiafoe |  6–3, 6–2  | 
  | 2017 |    Akira Santillan |    Ramkumar Ramanathan |  7–6(7–1), 6–2  | 
  | 2018 |    Evgeny Karlovskiy |    Jason Jung |  6–3, 6–2  | 
  | 2019 |    Bradley Klahn |    Jason Kubler |  6–2, 7–5  | 
 Doubles
    | Year  |  Champion  |  Runner-up  |  Score  | 
  | 1984  |    Dan Goldie     Michael Kures  |    Ricardo Acuña     Belus Prajoux  |  3–6, 6–4, 7–5  | 
  | 1985  |    Ricky Brown     Luke Jensen  |    Kelly Evernden     Brian Levine  |  6–4, 6–7, 6–4  | 
  | 1986 |  not held  | 
  | 1987  |    Tobias Svantesson     Jon Treml  |    Pieter Aldrich     Warren Green  |  6–3, 6–4  | 
  | 1988  |    Ricardo Acuña     Royce Deppe  |    Jared Palmer     Pete Sampras  |  6–4, 6–4  | 
  | 1989  |    Ville Jansson     Scott Warner  |    Bill Benjes     Arkie Engle  |  6–7, 6–4, 6–4  | 
  | 1990  |    Zeeshan Ali     Menno Oosting  |    Doug Flach     Luis Herrera  |  4–6, 6–3, 6–2  | 
  | 1991  |    Byron Black     Scott Melville  |    Keith Evans     Dave Randall  |  6–4, 4–6, 6–2  | 
  | 1992  |    Andrew Kratzmann     Roger Rasheed  |    Rick Witsken     Todd Witsken  |  6–3, 3–6, 6–3  | 
  | 1993  |    Wayne Arthurs     Mark Petchey  |    Pat Rafter     Sandon Stolle  |  7–6, 6–7, 6–4  | 
  | 1994  |    Brian MacPhie     David Witt  |    Doug Flach     Wade McGuire  |  7–5, 6–2  | 
  | 1995-96 |  not held  | 
  | 1997  |    Michael Sell     Myles Wakefield  |    Chad Clark     Ben Ellwood  |  6–3, 7–6  | 
  | 1998  |    Grant Silcock     Myles Wakefield  |    Geoff Grant     Mark Merklein  |  1–6, 7–6, 7–6  | 
  | 1999  |    James Blake     Thomas Blake  |    Max Mirnyi     Alexander Reichel  |  6–4, 6–7, 6–3  | 
  | 2000  |    Lee Hyung-taik     Yoon Yong-il  |    Matthew Breen     Luke Smith  |  2–6, 7–5, 6–3  | 
  | 2001-05 |  not held  | 
  | 2006  |    Cecil Mamiit     Eric Taino  |    Scoville Jenkins     Rajeev Ram  |  6–2, 6–4  | 
  | 2007  |    Patrick Briaud     Chris Drake  |    Nicholas Monroe     Izak van der Merwe  |  7–6, 6–4  | 
  | 2008  |    Todd Widom     Michael Yani  |    Chen Ti     Jose Statham  |  6–2, 6–2  | 
  | 2009  |    Carsten Ball     Travis Rettenmaier  |    Brett Joelson     Ryan Sweeting  |  6–1, 6–2  | 
  | 2010  |    Ryler DeHeart     Pierre-Ludovic Duclos  |    Rik de Voest     Somdev Devvarman  |  7–6(4), 4–6, [10–8]  | 
  | 2011  |    Treat Conrad Huey     Bobby Reynolds  |    Jordan Kerr     Travis Parrott  |  7–6(9–7), 6–4  | 
  | 2012  |    Devin Britton     Jeff Dadamo  |    John Peers     John-Patrick Smith  |  1–6, 6–2, [10–6]  | 
  | 2013  |    Yuki Bhambri     Michael Venus  |    Somdev Devvarman     Jack Sock  |  2–6, 6–2, [10–8]  | 
  | 2014  |    Thanasi Kokkinakis     Denis Kudla  |    Evan King     Raymond Sarmiento  |  6–2, 7–6(7–4)  | 
  | 2015  |    Johan Brunström     Nicholas Monroe  |    Sekou Bangoura     Frank Dancevic  |  4–6, 6–3, [10–8]  | 
  | 2016  |    Stefan Kozlov     John-Patrick Smith  |    Sekou Bangoura     David O'Hare  |  6–3, 6–3  | 
  | 2017  |    Sanchai Ratiwatana     Christopher Rungkat  |    Kevin King     Bradley Klahn  |  7–6(7–4), 6–2  | 
  | 2018  |    Austin Krajicek     Jeevan Nedunchezhiyan  |    Roberto Maytín     Christopher Rungkat  |  6–7(4–7), 6–4, [10–5]  | 
  | 2019  |    JC Aragone     Bradley Klahn  |    Christopher Eubanks     Thai-Son Kwiatkowski  |  7–5, 6–4  | 
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