Danai Udomchoke (Thai: ดนัย อุดมโชค, born 11 August 1981) is a former professional tennis player from Thailand. He was born in Bangkok, where he still resides.
Udomchoke turned professional in 1997, and was coached by Jan Stoce. He is sponsored by Dunlop Sport for his racquets and apparel. His career-best ranking was World No. 77 on 29 January 2007.
Udomchoke made his debut in the main draw of a Grand Slam in 2004 when he qualified for the US Open. He lost to Spaniard Tommy Robredo in straight sets. One of Udomchoke's highest profile matches was his 2006 Australian Open 1st round match against No. 3 seed David Nalbandian. After starting out slowly, Udomchoke shocked Nalbandian by winning the third and fourth sets. However, his energy soon wore down, and despite pushing the World No. 3 to five sets, Udomchoke lost 2–6, 2–6, 6–1, 7–6, 1–6. In the 2007 Australian Open, Udomchoke advanced to the third round, losing to 14th-seeded Novak Djokovic after defeating 24th-seeded Juan Carlos Ferrero. Udomchoke qualified for Wimbledon in 2007 and was defeated in the second round by Andy Roddick.
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