Mark Anthony Philippoussis (born 7 November 1976) is an Australian tennis player of Greek and Italian descent. He turned professional in 1994. His greatest achievements are winning two Davis Cup titles with Australia in 1999 and 2003, winning the deciding rubber in the final of each. He also reached the finals of the 1998 US Open and the 2003 Wimbledon tournaments, losing to countryman Pat Rafter and Swiss Roger Federer respectively. He reached a career-high singles ranking of World No. 8.