# 2025 Chennai Open Challenger – Singles

Sumit Nagal was the defending champion but chose not to defend his title.
Kyrian Jacquet won the title after defeating Elias Ymer 7–6$^{(7–1)}$, 6–4 in the final.

## Seeds

* Billy Harris (semifinals)
* Lloyd Harris (second round)
* Duje Ajduković (first round)
* Alexis Galarneau (second round)
* Shintaro Mochizuki (quarterfinals)
* Sho Shimabukuro (first round)
* Timofey Skatov (quarterfinals)
* Zsombor Piros (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 |
| 1 | Billy Harris | 6$^5$ | 6$^2$ | | | |
| | Elias Ymer | 7$^7$ | 7$^7$ | | | |
| | Elias Ymer | 7$^7$ | 7$^7$ | Elias Ymer | 6$^1$ | 4 |
| | | | | Kyrian Jacquet | 7$^7$ | 6 |
| | Kyrian Jacquet | 6 | 6 | Kyrian Jacquet | 7$^7$ | 6 |
| | Dalibor Svrčina | 4 | 1 | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | B Harris | 7 | 6 | | | | | | | | | | | | | |
| Q | Eric Vanshelboim | 5 | 2 | | 1 | B Harris | 6 | 6 | | | | | | | | |
| | E Kırkın | 6$^7$ | 7$^7$ | 0 | | E Kırkın | 3 | 3 | | | | | | | | |
| | J Veselý | 7$^9$ | 6$^3$ | 0$^r$ | | | | | 1 | B Harris | 6 | 7$^8$ | | | | |
| | A Karatsev | 7$^7$ | 6 | | | | | | 7 | T Skatov | 3 | 6$^6$ | | | | |
| | C Denolly | 6$^4$ | 4 | | | A Karatsev | 4 | 5 | | | | | | | | |
| Q | Hynek Bartoň | 4 | 4 | | 7 | T Skatov | 6 | 7 | | | | | | | | |
| 7 | T Skatov | 6 | 6 | | | | | | | | | | 1 | B Harris | 6$^5$ | 6$^2$ |
| 3 | D Ajduković | 2 | 7$^7$ | 2 | | | | | | | | | | E Ymer | 7$^7$ | 7$^7$ |
| | E Ymer | 6 | 6$^4$ | 6 | | E Ymer | 7 | 7$^7$ | | | | | | | | |
| | J Clarke | 6 | 7 | | | J Clarke | 5 | 6$^2$ | | | | | | | | |
| WC | R Ramanathan | 3 | 5 | | | | | | | E Ymer | 6 | 6 | | | | |
| Q | K Coppejans | 5 | 1$^r$ | | | | | | | R Noguchi | 2 | 3 | | | | |
| | R Noguchi | 7 | 3 | | | R Noguchi | 7 | 6 | | | | | | | | |
| | J Berrettini | 6 | 7$^7$ | | | J Berrettini | 5 | 3 | | | | | | | | |
| 6 | S Shimabukuro | 3 | 6$^4$ | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 5 | S Mochizuki | 6 | 6 | | | | | | | | | | | | | | |
| | E Dalla Valle | 2 | 1 | | 5 | S Mochizuki | 6 | 6 | | | | | | | | | |
| | M Geerts | 6 | 7$^7$ | | | M Geerts | 4 | 4 | | | | | | | | | |
| Q | Maxim Zhukov | 2 | 6$^5$ | | | | | | | 5 | S Mochizuki | 1 | 6 | 6$^6$ | | | |
| | K Jacquet | 6 | 6 | | | | | | | | K Jacquet | 6 | 4 | 7$^8$ | | | |
| WC | K Singh | 3 | 3 | | | K Jacquet | 6 | 6 | | | | | | | | | |
| Q | E Agafonov | 4 | 1 | | 4 | A Galarneau | 2 | 2 | | | | | | | | | |
| 4 | A Galarneau | 6 | 6 | | | | | | | | | | | | K Jacquet | 6 | 6 |
| 8 | Z Piros | 6$^4$ | 4 | | | | | | | | | | | | D Svrčina | 4 | 1 |
| | O Ovcharenko | 7$^7$ | 6 | | | O Ovcharenko | 0 | 7$^7$ | 6 | | | | | | | | |
| | A Zakharov | 6 | 6$^3$ | 6 | | A Zakharov | 6 | 6$^5$ | 4 | | | | | | | | |
| WC | M Sasikumar | 3 | 7$^7$ | 1 | | | | | | | O Ovcharenko | 3 | 0 | | | | |
| LL | S Gueymard Wayenburg | 7 | 6$^2$ | 0 | | | | | | | D Svrčina | 6 | 6 | | | | |
| | D Svrčina | 5 | 7$^7$ | 6 | | D Svrčina | 6 | 6 | | | | | | | | | |
| Q | Yurii Dzhavakian | 3 | 7 | 0 | 2 | L Harris | 1 | 1 | | | | | | | | | |
| 2 | L Harris | 6 | 5 | 6 | | | | | | | | | | | | | |