Gaël Sébastien Monfils (French pronunciation: ​[ɡaɛl mɔ̃ˈfis]; born 1 September 1986) is a French professional tennis player. Monfils is a former French No. 1, reaching a career-high singles ranking of World No. 7 and winning 5 singles titles. He was the runner-up at the Paris Masters in 2009 and 2010 and a semifinalist at the 2008 French Open.