Mark Calcavecchia isn’t the only 50-year-old in contention at St. Andrews right now. Tom Lehman, who won this tournament in 1996 and tied for fourth in 2000 here at St. Andrews, is 5 under for the week and in the top 10 (for now) after a 68 earlier.

Should Calcavecchia or Lehman go on to win, either one of them would become golf’s oldest winner of a mjaor championship. Here is a look at the 10 oldest major winners:

Julius Boros: 48 years, 4 months, 18 days 1968 PGA Championship
Tom Morris Sr.: 46 years, 3 months, 9 days 1867 Open Championship
Jack Nicklaus: 46 years, 2 months, 23 days 1986 Masters
Jerry Barber: 45 years, 3 months, 6 days 1961 PGA Championship
Hale Irwin: 45 years, 15 days 1990 U.S. Open
Lee Trevino: 44 years, 8 months, 18 days 1984 PGA Championship
Roberto de Vicenzo: 44 years, 3 months, 3 days 1967 Open Championship
Raymond Floyd: 43 years, 9 months, 11 days 1986 U.S. Open
Ted Ray: 43 years, 4 months, 16 days 1920 U.S. Open
Julius Boros: 43 years, 3 months, 20 days 1963 U.S. Open