(1975- ) a US GOLFER who, in 1997, became the youngest person ever to win the US MASTERS TOURNAMENT . In 2000 he won the US Open and The Open (in Britain). This made him the youngest player to have won all four Majors (= the two Opens, the US Masters, and the PGA) . In 2001 he won the US Masters to complete a GRAND SLAM of holding all four major titles at the same time.