# 2019 Knoxville Challenger – Singles

Reilly Opelka was the defending champion but chose not to defend his title.
Michael Mmoh won the title after defeating Christopher O'Connell 6–4, 6–4 in the final.

## Seeds

All seeds receive a bye into the second round.
* Tommy Paul (semifinals)
* Brayden Schnur (second round)
* Bradley Klahn (second round)
* Taro Daniel (second round)
* Denis Kudla (second round)
* Paolo Lorenzi (second round)
* Marcos Giron (second round)
* Christopher O'Connell (final)
* Blaž Rola (quarterfinals)
* Emilio Gómez (third round)
* Peter Polansky (third round)
* Darian King (second round)
* Vasek Pospisil (third round, retired)
* Maxime Janvier (withdrew)
* Alexey Vatutin (second round)
* Mitchell Krueger (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Tommy Paul | 2 | 6 | 7$^7$ | | | | | | | | |
| 9 | Blaž Rola | 6 | 1 | 6$^4$ | | | | | | | | |
| 9 | Blaž Rola | 6 | 1 | 6$^4$ | 1 | Tommy Paul | 6$^3$ | 3 | | | | |
| | | | | | 8 | Christopher O'Connell | 7$^7$ | 6 | | | | |
| | Ernesto Escobedo | 7$^7$ | 4 | 4 | 8 | Christopher O'Connell | 7$^7$ | 6 | | | | |
| 8 | Christopher O'Connell | 6$^2$ | 6 | 6 | | | | | | | | |
| 8 | Christopher O'Connell | 6$^2$ | 6 | 6 | | | | | 8 | Christopher O'Connell | 4 | 4 |
| | | | | | | | | | | Michael Mmoh | 6 | 6 |
| | Michael Mmoh | 6 | 6 | | | | | | | | | | Michael Mmoh | 6 | 6 |
| WC | Aleksandar Kovacevic | 4 | 3 | | | | | | | | | |
| WC | Aleksandar Kovacevic | 4 | 3 | | | Michael Mmoh | 6 | 7$^7$ | | | | |
| | | | | | | Liam Broady | 2 | 6$^5$ | | | | |
| | Liam Broady | 6 | 1 | 6 | | Liam Broady | 2 | 6$^5$ | | | | |
| | Gijs Brouwer | 3 | 6 | 3 | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | T Paul | 6 | 6$^{10}$ | 7$^7$ | | | | | | | | | |
| | E King | 5 | 6 | 6 | | E King | 2 | 7$^{12}$ | 6$^1$ | | | | | | | | | |
| WC | Nathan Ponwith | 7 | 4 | 2 | | | | | | 1 | T Paul | 6 | 0 | | | | | |
| | S Korda | 6$^7$ | 7 | 6 | | | | | | 13 | V Pospisil | 4 | 0$^r$ | | | | | |
| | R Peniston | 7$^9$ | 5 | 0 | | S Korda | 4 | 4 | | | | | | | | | | |
| | | | | | 13 | V Pospisil | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 1 | T Paul | 2 | 6 | 7$^7$ |
| | | | | | | | | | | | | | | 9 | B Rola | 6 | 1 | 6$^4$ |
| | | | | | 9 | B Rola | 6 | 6 | | | | | | | | | | |
| Q | A Vavassori | 7$^{13}$ | 6 | | Q | A Vavassori | 3 | 4 | | | | | | | | | | |
| | Mi Redlicki | 6$^{11}$ | 2 | | | | | | | 9 | B Rola | 6 | 6 | | | | | |
| | R Quiroz | 7$^{12}$ | 2 | 3 | | | | | | | D Popko | 4 | 4 | | | | | |
| | D Popko | 6$^{10}$ | 6 | 6 | | D Popko | 4 | 6 | 6 | | | | | | | | | |
| | | | | | 6 | P Lorenzi | 6 | 2 | 4 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 4 | T Daniel | 6$^6$ | 4 | | | | | | | | | | |
| A Menéndez Maceiras | 6 | 3 | 2 | | J. J. Wolf | 7$^8$ | 6 | | | | | | | | | | |
| J. J. Wolf | 2 | 6 | 6 | | | | | | | J. J. Wolf | 3 | 2 | | | | | |
| JC Aragone | 6$^{12}$ | 6$^4$ | | | | | | | | E Escobedo | 6 | 6 | | | | | |
| E Escobedo | 7$^{14}$ | 7$^7$ | | | E Escobedo | 5 | 7 | 6 | | | | | | | | | |
| | | | | 15 | A Vatutin | 7 | 5 | 3 | | | | | | | | | |
| | | | | | | | | | | | | | | E Escobedo | 7$^7$ | 4 | 4 |
| | | | | | | | | | | | | | 8 | C O'Connell | 6$^2$ | 6 | 6 |
| | | | | 11 | P Polansky | 6 | 7 | | | | | | | | | | |
| B Kavčič | 2 | 6$^2$ | | | E Leshem | 2 | 5 | | | | | | | | | | |
| E Leshem | 6 | 7$^7$ | | | | | | | 11 | P Polansky | 2 | 3 | | | | | |
| K King | 6 | 6 | | | | | | | 8 | C O'Connell | 6 | 6 | | | | | |
| E Hoyt | 1 | 4 | | | K King | 5 | 3 | | | | | | | | | | |
| | | | | 8 | C O'Connell | 7 | 6 | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | D Kudla | 6$^5$ | 2 | | | | | | | | | | |
| | Roy Smith | 6 | 3 | 6 | | R Smith | 7$^7$ | 6 | | | | | | | | | | |
| WC | Scott Jones | 3 | 6 | 4 | | | | | | | R Smith | 4 | 2 | | | | | |
| | R Cid Subervi | 1 | 2 | | | | | | | | M Mmoh | 6 | 6 | | | | | |
| | M Mmoh | 6 | 6 | | | M Mmoh | 6 | 2 | 6 | | | | | | | | | |
| | | | | | 12 | D King | 3 | 6 | 0 | | | | | | | | | |
| | | | | | | | | | | | | | | | | M Mmoh | 6 | 6 |
| | | | | | | | | | | | | | | | WC | A Kovacevic | 4 | 3 |
| | | | | | 16 | M Krueger | 6 | 6$^4$ | 4 | | | | | | | | | |
| Q | S Kirchheimer | 2 | 7$^{11}$ | 3 | | S Bangoura | 3 | 7$^7$ | 6 | | | | | | | | | |
| | S Bangoura | 6 | 6$^9$ | 6 | | | | | | | S Bangoura | 4 | 6 | 4 | | | | |
| WC | A Kovacevic | 7 | 7 | | | | | | | WC | A Kovacevic | 6 | 4 | 6 | | | | |
| | K Uchida | 5 | 5 | | WC | A Kovacevic | 3 | 7$^9$ | 6 | | | | | | | | | |
| | | | | | 3 | B Klahn | 6 | 6$^7$ | 4 | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | M Giron | 6 | 6$^3$ | 5 | | | | | | | | | |
| | L Broady | 7$^7$ | 6 | | | L Broady | 2 | 7$^7$ | 7 | | | | | | | | | |
| | D Young | 6$^5$ | 3 | | | | | | | | L Broady | 7 | 5 | 7 | | | | |
| | A Ritschard | 4 | 7$^7$ | 6 | | | | | | 10 | E Gómez | 5 | 7 | 5 | | | | |
| WC | Z Svajda | 6 | 6$^4$ | 3 | | A Ritschard | 6 | 1 | 2 | | | | | | | | | |
| | | | | | 10 | E Gómez | 3 | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | L Broady | 6 | 1 | 6 |
| | | | | | | | | | | | | | | | G Brouwer | 3 | 6 | 3 |
| | | | | | LL | L Glasspool | 6$^5$ | 6 | 6$^5$ | | | | | | | | | |
| WC | B Nakashima | 6 | 6 | | WC | B Nakashima | 7$^7$ | 3 | 7$^7$ | | | | | | | | | |
| | F Peliwo | 2 | 2 | | | | | | | WC | B Nakashima | 2 | 3 | | | | | |
| | G Brouwer | 6 | 6 | | | | | | | | G Brouwer | 6 | 6 | | | | | |
| | J Sels | 3 | 2 | | | G Brouwer | 7 | 6 | | | | | | | | | | |
| | | | | | 2 | B Schnur | 5 | 3 | | | | | | | | | | |