| Efe Üstündağ | |
| Birth Date: | 15 January 1977 |
| Birth Place: | Istanbul, Turkey |
| Careerprizemoney: | $12,203 |
| Singlesrecord: | 4–8 (Davis Cup) |
| Highestsinglesranking: | No. 599 (31 Jul 2000) |
| Doublesrecord: | 0–2 (Davis Cup) |
| Highestdoublesranking: | No. 373 (24 Jul 2000) |
Efe Üstündağ (born 15 January 1977) is a Turkish former professional tennis player. He was a member of the Turkey Davis Cup team from 1998 to 2001 and won two ITF Futures doubles titles.[1]
Üstündağ, a native of Istanbul, has been Rice University men's head coach since 2012. He was both the 2016 and 2017 C-USA tennis Coach of the Year.[2] A former Rice University player, Üstündağ twice earned All-American honors. In 1999 he and Shane Stone were NCAA doubles quarter-finalists.[3]
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score | |
|---|---|---|---|---|---|---|---|---|
| Win | 1–0 | Belarus F1, Minsk | Carpet |  Raviv Weidenfeld |  Barry Fulcher Paul Maggs | 6–3, 6–7, 6–2 | ||
| Win | 2–0 | Russia F3, Tolyatti | Hard | Raviv Weidenfeld |  Artem Derepasko Kirill Ivanov-Smolensky | 2–6, 6–3, 6–4 | ||
| Loss | 2–1 | Uzbekistan F3, Guliston | Hard |  Erhan Oral |  Alexander Shvets  Dmitri Tomashevich | 3–6, 1–6 | ||
| Loss | 2–2 | USA F4, Corpus Christi | Hard |  Manuel Jorquera |  Bobby Kokavec  Cristian Kordasz | 2–6, 3–6 | ||
| Loss | 2–3 | Turkey F1, Istanbul | Hard |  Angel-Jose Martin-Arroyo |  Sebastien Swierk Josh Tuckfield | 6–7(5), 3–6 | ||
| Loss | 2–4 | Turkey F3, Istanbul | Hard |  Cedric Kauffmann | Sebastien Swierk Josh Tuckfield | 3–6, 5–7 |