Mark John Calcavecchia (born June 12, 1960) is an American professional golfer and a former PGA Tour member.

[4] While playing in junior tournaments, Calcavecchia often competed against Jack Nicklaus' son, Jackie, and as a result began a lifelong friendship at the age of 14 with the legendary pro.

[5][6] He accepted an athletic scholarship to the University of Florida in Gainesville, where he played for head coach Buster Bishop and head coach John Darr's Florida Gators men's golf teams in National Collegiate Athletic Association (NCAA) competition from 1978 to 1980.

[7] Calcavecchia turned professional in 1981 and joined the PGA Tour in 1982, but lost his card after the 1985 season.

[9][10] Upon being awarded the Open's Claret Jug, Calcavecchia (whose Italian surname translates as "old crowd") asked "How's my name going to fit on that thing?

[15] In winning the 2001 Phoenix Open, he set the Tour scoring record at that time by making 32 birdies in 72 holes finishing at 28 under par for the tournament.

[citation needed] On July 25, 2009, Calcavecchia set a PGA Tour record by getting nine consecutive birdies during his second round at the RBC Canadian Open at the Glen Abbey Golf Course in Oakville, Ontario, Canada.