Tamarine Tanasugarn (Thai: แทมมารีน ธนสุกาญจน์, ; born 24 May 1977) is a professional Thai tennis player. She was born in Los Angeles, United States, and turned professional in 1994. She has been in the top 20 in both singles and doubles.
Tanasugarn's highest Women's Tennis Association (WTA) world ranking was no. 19, achieved on 13 May 2002, which is the highest ranking ever achieved for a Thai female player. She has won four singles titles and five doubles titles. She was briefly a doubles partner with Maria Sharapova, with whom she won two titles in 2003. Her highest world doubles ranking was no. 15, which she achieved on 13 September 2004. With Liezel Huber, she reached the 2004 US Open doubles quarterfinals, and at the 2011 Wimbledon Championships, she reached the women's doubles semifinal with Marina Erakovic. Her biggest success so far came in 2008, when she reached quarterfinals at Wimbledon.
In her career, Tanasugarn has defeated former and current no. 1 players, including Amélie Mauresmo, Jennifer Capriati, Jelena Janković, and Dinara Safina. She has also beaten Australian Open and French Open champion Mary Pierce.
Tanasugarn is regarded as a grass-court specialist; she has won most matches on the surface including two grass-court International titles. Tanasugarn currently holds the record of the most singles matches won on grass court among WTA active players and is 12th on the all-time list.
Tanasugarn is also a regular competitor for the Thailand Fed Cup team, helping the team join the World Group II in 2005 and 2006, after beating Australia and Croatia in their play-off matches.