Why Famous: Won the US Masters and the British Open in 1988.
- 1979-09-02 US Men's Amateur Golf Championship, Canterbury GC: Mark O'Meara wins 8 & 7 over John Cook
- 1996-09-15 Presidents Cup Golf, Robert Trent Jones GC: Mark O'Meara and David Duval are undefeated as US edges International team, 16½-15½
- 1998-04-12 62nd US Masters Tournament, Augusta National GC: Mark O'Meara claims his first major title with a 20-foot birdie putt on the final hole to win by 1 stroke from David Duval and Fred Couples
- 1998-07-19 British Open Men's Golf, Royal Birkdale GC: Mark O'Meara wins his 2nd major championship of the year (Masters) and first Open title by 2 in a 4-hole aggregate playoff with fellow American Brian Watts
- 2007-07-29 British Senior Open Men's Golf, Muirfield: Tom Watson wins his 3rd Open Senior title by 1 shot from Mark O'Meara and Stewart Ginn
- 2010-10-10 Senior Players Championship Men's Golf, TPC Potomac: Mark O'Meara wins his lone Champions Tour major title with par on first playoff hole against Michael Allen
- 2011-07-31 US Senior Open Men's Golf, Inverness Club: Olin Browne wins by 3 strokes ahead of Mark O'Meara; 5th player in history to win on Nationwide Tour, PGA Tour and Champions Tour