Harry Vardon, he has won 6. 1896, 1898, 1899, 1903, 1911 and 1914.
Catherine Bellis has one most of the US open championships. She is young.
Jack Nicklaus with 6.
Daren Clarke won the 2011 US open golf.
Zach Johnson
Rafael Nadal has won the most number of singles title at French Open.
1998 Masters: Mark O'Meara, 1998 U S Open: Lee Janzen, 1998 British Open: Mark O'Meara
Harry Vardon has won the most Open Championships, winning the Claret Jug 6 times (1896, 1898, 1899, 1903, 1911, 1914).James Braid, John Henry Taylor, Peter Thomson, and Tom Watson have all won it 5 times.
Padraig Harrington won three major championships during his professional golf career. He won the British Open in 2007 and 2008, as well as the PGA Championship in 2008.
The Boston Celtics won the most NBA championships. They won 17 NBA Titles (
Seve Ballesteros won over 90 international tournaments. He also won the World Match Play Championship 5 times and The Open Championship 3 times. In total he won around 100 major golf tournaments.
The Yankees have won the most championships in sports. They have won 27 World Series. The Lakers have won 16 NBA championships.
UCLA has won 11 NCAA mens championships. Tennessee has won 8 NCAA women's championships.