The 2013 Nielsen Pro Tennis Championship was a professional tennis tournament played on hard courts. It was the 22nd edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Winnetka, Illinois, between 1 and 7 July 2013.
Singles main-draw entrants
Seeds
1 Rankings are as of June 24, 2013.
Other entrants
The following players received wildcards into the singles main draw: Jarmere Jenkins Evan King Dennis Nevolo Jack Sock
The following players received entry as an alternate into the singles main draw: Eric Quigley Michael McClune Ante Pavić
The following players received entry from the qualifying draw: Sekou Bangoura Jeff Dadamo Kevin King Mārtiņš Podžus
Champions
Singles
Jack Sock def. Bradley Klahn 6–4, 6–2
Doubles
Yuki Bhambri / Michael Venus def. Somdev Devvarman / Jack Sock 2–6, 6–2, [10–8]