Who was the first left-handed golfer to win the U.S. Amateur title?

Philip Alfred Mickelson (born June 16, 1970), nicknamed Lefty, is an American professional golfer. He has won 42 events on the PGA Tour, including five major championships: three Masters titles (2004, 2006, 2010), a PGA Championship (2005), and an Open Championship (2013). Mickelson is one of 16 golfers in the history of the sport to win at least three of the four majors. He has won every major except the U.S. Open, where he has finished runner-up a record six times.

Mickelson was the second collegiate golfer to earn first-team All-American honors. In 1990, he also became the first golfer with a left-handed swing to win the U.S. Amateur title. Mickelson secured perhaps his greatest achievement as an amateur in January 1991, winning his first PGA Tour event, the Northern Telecom Open, in Tucson. At age 20, he was only the sixth amateur to win a tour event, and the first in over five years,