- Source: 2019 Nielsen Pro Tennis Championship
- 2019 Nielsen Pro Tennis Championship
- 2019 Nielsen Pro Tennis Championship – Singles
- 2019 Nielsen Pro Tennis Championship – Doubles
- 2018 Nielsen Pro Tennis Championship – Singles
- 2018 Nielsen Pro Tennis Championship – Doubles
- Nielsen Pro Tennis Championship
- 2018 Nielsen Pro Tennis Championship
- Kurt Nielsen
- Tennis pro tours and tournament ranking series
- Jack Kramer
The 2019 Nielsen Pro Tennis Championship was a professional tennis tournament played on hard courts. It was the 28th edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Winnetka, Illinois, between 8 and 14 July 2019.
Singles main-draw entrants
= Seeds
=1 Rankings are as of July 1, 2019.
= Other entrants
=The following players received wildcards into the singles main draw:
Stefan Dostanic
Bjorn Fratangelo
Denis Istomin
Sam Riffice
Alex Rybakov
The following player received entry into the singles main draw using a protected ranking:
Maximilian Neuchrist
The following players received entry into the singles main draw using their ITF World Tennis Ranking:
Jordi Arconada
Sekou Bangoura
Aziz Dougaz
Michail Pervolarakis
Martin Redlicki
The following players received entry from the qualifying draw:
Felix Corwin
John McNally
Champions
= Singles
=Bradley Klahn def. Jason Kubler 6–2, 7–5.
= Doubles
=JC Aragone / Bradley Klahn def. Christopher Eubanks / Thai-Son Kwiatkowski 7–5, 6–4.