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Guilherme Sarti Clezar (pronounced Clézar; born 31 December 1992), 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. Brasileiros avançam à chave principal do Brasil Open
| ATP Challenger Tour Finals (0–1) |
| ATP Challenger Tour (2–4) |
| Winner | 1. | Rio Quente, Brazil | Hard | Paul Capdeville | 7–6(7–4), 6–3 | |
| Winner | 2. | Campinas, Brazil | Clay | Facundo Bagnis | 6–4, 6–4 | |
| Runner-up | 1. | São Paulo, Brazil | Clay (i) | Diego Schwartzman | 2–6, 3–6 | |
| Runner-up | 2. | Santiago, Chile | Clay | Facundo Bagnis | 2–6, 7–5, 2–6 | |
| Runner-up | 3. | Rio de Janeiro, Brazil | Clay | Facundo Bagnis | 4–6, 6–4, 2–6 | |
| Runner-up | 4. | Liberec, Czech Republic | Clay | Pedro Sousa | 4–6, 7–5, 2–6 | |
| Runner-up | 5. | Cali, Colombia | Clay | Federico Delbonis | 6–7(10-12), 5–7 |
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