Which professional golfer goes by the nickname ‘Lefty’?
The professional golfer who goes by the nickname "Lefty" is Phil Mickelson. Phil Mickelson is a highly successful American golfer and has been one of the most prominent figures in professional golf for many years. He is known for his left-handed swing, hence the nickname "Lefty." Mickelson has won numerous tournaments, including multiple major championships, and has been a fan favorite throughout his career.