2021 JSM Challenger of Champaign–Urbana – Doubles
# 2021 JSM Challenger of Champaign–Urbana – Doubles

Christopher Eubanks and Kevin King were the defending champions but chose not to defend their title.

Nathaniel Lammons and Jackson Withrow won the title after defeating Treat Huey and Max Schnur 6–4, 3–6, [10–6] in the final.

## Seeds

* Nathaniel Lammons / Jackson Withrow (champions)
* Treat Huey / Max Schnur (final)
* JC Aragone / Robert Galloway (quarterfinals)
* Ruan Roelofse / Christopher Rungkat (semifinals)

## 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

| First round | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | N Lammons J Withrow | 6 | 3 | [10] | | | | | | | | | | | | | | | |
| | T-S Kwiatkowski A Lawson | 4 | 6 | [6] | 1 | N Lammons J Withrow | 6 | $7^8$ | | | | | | | | | | | |
| | R Gonzales H Johnson | 4 | $7^7$ | [9] | | G Brouwer R Stalder | 4 | $6^6$ | | | | | | | | | | | |
| | G Brouwer R Stalder | 6 | $6^5$ | [11] | | | | | | 1 | N Lammons J Withrow | $7^7$ | $6^4$ | [10] | | | | | |
| 4 | R Roelofse C Rungkat | 6 | 6 | | | | | | | 4 | R Roelofse C Rungkat | $6^4$ | $7^7$ | [6] | | | | | |
| WC | Felix Corwin Wally Thayne | 4 | 2 | | 4 | R Roelofse C Rungkat | $6^5$ | 6 | [10] | | | | | | | | | | |
| | A Kadhe T-l Wu | 5 | 5 | | | A Kovacevic A Vukic | $7^7$ | 3 | [8] | | | | | | | | | | |
| | A Kovacevic A Vukic | 7 | 7 | | | | | | | | | | | | 1 | N Lammons J Withrow | 6 | 3 | [10] |
| | D Marrero Y Uchiyama | | | | | | | | | | | | | | 2 | T Huey M Schnur | 4 | 6 | [6] |
| | A Galarneau N Mejía | w/o | | | | A Galarneau N Mejía | 6 | 4 | [10] | | | | | | | | | | |
| | J Jung E King | 3 | 5 | | 3 | JC Aragone R Galloway | 4 | 6 | [8] | | | | | | | | | | |
| 3 | JC Aragone R Galloway | 6 | 7 | | | | | | | | A Galarneau N Mejía | 0 | 2 | | | | | | |
| | M Jaziri D Novikov | 4 | 4 | | | | | | | 2 | T Huey M Schnur | 6 | 6 | | | | | | |
| WC | V Kirkov B Shelton | 6 | 6 | | WC | V Kirkov B Shelton | 5 | 3 | | | | | | | | | | | |
| WC | Hunter Heck Lucas Horve | 3 | 2 | | 2 | T Huey M Schnur | 7 | 6 | | | | | | | | | | | |
| 2 | T Huey M Schnur | 6 | 6 | | | | | | | | | | | | | | | | |
