Dalwinder Singh defeated Vishnu Vardhan 6-2 6-7 10-5 in the M15 Lucknow 1 q32 on hard. The upset overturned the form book — Vishnu Vardhan came in leading the head-to-head 3–0, but Dalwinder Singh had been the form player, winning 7 of their last 10 on hard. Dalwinder Singh claimed a first win over Vishnu Vardhan in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-11-17 | M15 New Delhi 2 | R32 | hard | Vishnu Vardhan | 6-2 6-4 |
| 2016-05-09 | India F3 | F | hard | Vishnu Vardhan | 7-6(4) 6-4 |
| 2015-06-15 | India F8 | R16 | clay | Vishnu Vardhan | 6-0 3-0 |