Guilherme Clezar
Guilherme Sarti Clezar, is a professional tennis player from Brazil. Clezar plays mainly in ATP Challenger Tour events.
He played also in several ATP 250 events, including the 2011 Brasil Open.
Career finals
Singles: 7 (2–5)
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
| Winner | 1. | Rio Quente, Brazil | Hard |  dts|format=mdy|2013-09-22 |