| 2019 Nielsen Pro Tennis Championship | |
|---|---|
| Date | 8–14 July |
| Edition | 28th |
| Surface | Hard |
| Location | Winnetka, Illinois, United States |
| Champions | |
| Singles | |
 Bradley Klahn | |
| Doubles | |
| JC Aragone / Bradley Klahn | |
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.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| USA | Bradley Klahn | 87 | 1 |
 AUS | Matthew Ebden | 95 | 2 |
 ARG | Guido Andreozzi | 114 | 3 |
 UZB | Denis Istomin | 115 | 4 |
 TPE | Jason Jung | 117 | 5 |
| USA | Bjorn Fratangelo | 133 | 6 |
 ESP | Adrián Menéndez Maceiras | 146 | 7 |
 IND | Ramkumar Ramanathan | 151 | 8 |
| USA | Michael Mmoh | 152 | 9 |
 FRA | Quentin Halys | 157 | 10 |
| USA | Mitchell Krueger | 183 | 11 |
| AUS | Jason Kubler | 188 | 12 |
| AUS | Thanasi Kokkinakis | 192 | 13 |
| USA | Christopher Eubanks | 193 | 14 |
| USA | Donald Young | 197 | 15 |
| USA | Thai-Son Kwiatkowski | 205 | 16 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
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 Bradley Klahn def. Jason Kubler 6–2, 7–5. JC Aragone / Bradley Klahn def. Christopher Eubanks / Thai-Son Kwiatkowski 7–5, 6–4.