Marat Mubinovich Safin is a Russian former professional tennis player and current coach. He was ranked as the world No. 1 in men's singles by the Association of Tennis Professionals (ATP) for nine weeks. Safin won 15 ATP Tour-level singles titles, including two majors at the 2000 US Open and 2005 Australian Open, and helped lead Russia to Davis Cup titles in 2002 and 2006. ATP world No. 1 from January 29, 2001 to February 25, 2001 — 4 weeks. Wiki link