title: 2021 Las Vegas Challenger – Singles
text: # 2021 Las Vegas Challenger – Singles
  
  Vasek Pospisil was the defending champion but chose not to defend his title.
  
  J. J. Wolf won the title after defeating Stefan Kozlov 6–4, 6–4 in the final.
  
  ## Seeds
  
  * Steve Johnson (first round)
  * Denis Kudla (second round)
  * Tennys Sandgren (first round, retired)
  * Daniel Altmaier (second round)
  * Taro Daniel (quarterfinals)
  * Mitchell Krueger (first round)
  * Emilio Gómez (quarterfinals)
  * Jason Jung (first 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
  
  | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
  | - | - | - | - | - | - | - | - |
  | Alt | Stefan Kozlov | 6 | 6 | | | | |
  | WC | Aleksandar Kovacevic | 2 | 4 | | | | |
  | WC | Aleksandar Kovacevic | 2 | 4 | Alt | Stefan Kozlov | 4 | 4 |
  | | | | | | J. J. Wolf | 6 | 6 |
  | | Michael Mmoh | 3 | 2 | | J. J. Wolf | 6 | 6 |
  | | J. J. Wolf | 6 | 6 | | | | |
  
  ### Top half
  
  | First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | 1 | S Johnson | 4 | 4 | | | | | | | | | | | | | | |
  | LL | A McHugh | 6 | 6 | | LL | A McHugh | 2 | 7 | $6^{13}$ | | | | | | | | |
  | Q | M Sasikumar | 2 | 4 | | Alt | S Kozlov | 6 | 5 | $7^{15}$ | | | | | | | | |
  | Alt | S Kozlov | 6 | 6 | | | | | | | Alt | S Kozlov | $7^7$ | 6 | | | | |
  | | J Kubler | $6^5$ | 6 | $7^8$ | | | | | | 7 | E Gómez | $6^3$ | 4 | | | | |
  | | Yo Watanuki | $7^7$ | 0 | $6^6$ | | J Kubler | 6 | 0 | $6^8$ | | | | | | | | |
  | | C-M Stebe | $6^2$ | 0 | | 7 | E Gómez | 2 | 6 | $7^{10}$ | | | | | | | | |
  | 7 | E Gómez | $7^7$ | 6 | | | | | | | | | | | Alt | S Kozlov | 6 | 6 |
  | 4 | D Altmaier | $7^8$ | 6 | | | | | | | | | | | WC | A Kovacevic | 2 | 4 |
  | | Y Uchiyama | $6^6$ | 1 | | 4 | D Altmaier | $6^7$ | 3 | | | | | | | | | |
  | WC | A Kovacevic | 6 | 3 | $7^7$ | WC | A Kovacevic | $7^9$ | 6 | | | | | | | | | |
  | | C Eubanks | 1 | 6 | $6^5$ | | | | | | WC | A Kovacevic | 6 | 6 | | | | |
  | Q | D Young | 4 | 4 | | | | | | | 5 | T Daniel | 3 | 2 | | | | |
  | | T Ito | 6 | 6 | | | T Ito | 2 | 1 | | | | | | | | | |
  | WC | Jordan Sauer | 0 | 2 | | 5 | T Daniel | 6 | 6 | | | | | | | | | |
  | 5 | T Daniel | 6 | 6 | | | | | | | | | | | | | | |
  
  ### Bottom half
  
  | First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | 6 | M Krueger | 4 | 1 | | | | | | | | | | | | | |
  | | A Vukic | 6 | 6 | | | A Vukic | 4 | 4 | | | | | | | | |
  | | M Mmoh | 6 | 6 | | | M Mmoh | 6 | 6 | | | | | | | | |
  | LL | N Chappell | 2 | 1 | | | | | | | M Mmoh | 6 | $6^5$ | 6 | | | |
  | Q | D Kelly | 6 | 6 | | | | | | | M Torpegaard | 1 | $7^7$ | 1 | | | |
  | WC | Christopher Bulus | 3 | 2 | | Q | D Kelly | 2 | 3 | | | | | | | | |
  | | M Torpegaard | $6^4$ | 7 | 3 | | M Torpegaard | 6 | 6 | | | | | | | | |
  | 3 | T Sandgren | $7^7$ | 5 | $0^r$ | | | | | | | | | | M Mmoh | 3 | 2 |
  | 8 | J Jung | 5 | 2 | | | | | | | | | | | J. J. Wolf | 6 | 6 |
  | | T-S Kwiatkowski | 7 | 6 | | | T-S Kwiatkowski | 5 | 2 | | | | | | | | |
  | | B Fratangelo | $7^8$ | $6^2$ | $6^5$ | | E Escobedo | 7 | 6 | | | | | | | | |
  | | E Escobedo | $6^6$ | $7^7$ | $7^7$ | | | | | | E Escobedo | 3 | 3 | | | | |
  | Q | S Mochizuki | 3 | 5 | | | | | | | J. J. Wolf | 6 | 6 | | | | |
  | | J. J. Wolf | 6 | 7 | | | J. J. Wolf | 4 | 6 | 6 | | | | | | | |
  | | B Schnur | 3 | 2 | | 2 | D Kudla | 6 | 3 | 0 | | | | | | | |
  | 2 | D Kudla | 6 | 6 | | | | | | | | | | | | | |
  