|Country|| United States
June 27, 1976 |
|Plays||Right-handed (2-handed backhand)|
|Highest ranking||No. 72 (11 October 1999)|
|Current ranking||No. 1565 (3 December 2012)|
|Grand Slam Singles results|
|Australian Open||2R (1999, 2001)|
|French Open||2R (2001, 2002)|
|Wimbledon||1R (1999, 2001, 2002)|
|US Open||2R (1999)|
|Highest ranking||No. 102 (30 October 2006)|
|Grand Slam Doubles results|
|US Open||1R (1996, 1999, 2000)|
Last updated on: December 8, 2012.
|Competitor for United States|
|Pan American Games|
|Silver||1999 Winnipeg||Men's Singles|
|Competitor for Philippines|
|Bronze||2006 Doha||Men's Singles|
|Bronze||2006 Doha||Men's Doubles|
|Southeast Asian Games|
|Gold||2005 Manila||Men's Team|
|Gold||2005 Manila||Mixed Doubles|
|Silver||2005 Manila||Men's Doubles|
|Bronze||2005 Manila||Men's Singles|
|Silver||2007 Korat||Men's Doubles|
|Silver||2007 Korat||Mixed Doubles|
|Bronze||2007 Korat||Men's Singles|
|Bronze||2007 Korat||Men's Team|
|Gold||2009 Vientiane||Men's Singles|
|Gold||2009 Vientiane||Men's Team|
|Silver||2009 Vientiane||Men's Doubles|
|Bronze||2009 Vientiane||Mixed Doubles|
|Silver||2011 Indonesia||Men's Doubles|
|Silver||2011 Indonesia||Men's Team|
|Bronze||2011 Indonesia||Men's Singles|
Cecil Valdeavilla Mamiit (born June 27, 1976 in Los Angeles, California) is a tennis player from the United States who now represents the Philippines. He began his professional career in 1996. He reached his highest individual ranking in the ATP Tour on October 11, 1999, when he became World No. 72.
Mamiit won the silver medal in the men's tournament at the 1999 Pan American Games in Winnipeg, Canada, after losing the final to fellow American Paul Goldstein. At the 2006 Asian Games held in Doha, Cecil won bronze in the men's tennis singles event losing to Lee Hyung Taik of South Korea. In the doubles event he, along with fellow Filipino-American tennis player Eric Taino, won bronze losing to top doubles players Mahesh Bhupathi and Leander Paes of India.
His best tournament result was at the 1999 San Jose tournament. As a qualifier he defeated Kenneth Carlsen, Andre Agassi (although Agassi was up 6–0 6–6 before he defaulted), Mark Woodforde, and Michael Chang before losing to Aussie Mark Philippoussis 6–3 6–2.
Mamiit represents the Philippines Davis Cup team, where he was undefeated until 2008.
On December 30, 2007, 2-time Southeast Asian (SEA) Games singles champion Cecil Mamiit and renowned healing Catholic priest Father Fernando Suarez teamed up to defeat former Davis Cuppers Felix Barrientos and Roland So, 6–3, 1–6, 6–1, at the Manila Polo Club tennis courts.
As of June 7, 2010, Mamiit's singles ranking is World No. 497. He lost the final of the 2010 US Open National Playoffs to Blake Strode. By winning, Strode received a USTA wild card into the 2010 U.S. Open singles qualifying draw.
From January 2011 through the clay court season Mamiit was the hitting partner for Maria Sharapova.
Titles (7) 
|Grand Slam (0)|
|Tennis Masters Cup (0)|
|ATP Masters Series (0)|
|ATP Tour (0)|
|ITF Titles (7)|
Singles (9) 
|No.||Date||Tournament||Surface||Opponent in the final||Score|
|1.||July 13, 1998||Aptos||Hard||Takao Suzuki||6–7, 6–3, 6–2|
|2.||November 9, 1998||Las Vegas||Hard||Maurice Ruah||7–5, 6–3|
|3.||November 23, 1998||Burbank||Hard||David Nainkin||7–6, 7–5|
|4.||December 6, 1999||Burbank||Hard||Alex O'Brien||7–5, 6–3|
|5.||May 31, 2004||Tallahassee||Hard||Björn Rehnquist||6–4, 4–6, 7–5|
|6.||May 30, 2005||Yuba City||Hard||Paul Goldstein||6–4, 6–4|
|7.||September 11, 2006||New Orleans||Hard||Amer Delic||6–3, 7–6|