2021 Split Open – Doubles
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Treat Huey and Nathaniel Lammons were the defending champions but chose not to defend their title.
Andrey Golubev and Aleksandr Nedovyesov won the title after defeating Szymon Walków and Jan Zieliński 7–5, 6–7(5–7), [10–5] in the final.
Seeds
- Kazakhstan Andrey Golubev / Kazakhstan Aleksandr Nedovyesov (champions)
- France Albano Olivetti / Australia Matt Reid (semifinals)
- United States Robert Galloway / United States Alex Lawson (quarterfinals)
- India Purav Raja / Austria Tristan-Samuel Weissborn (quarterfinals)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted