Answer
Payne Stewart won two U.S. Open titles during his illustrious golf career. His first victory came in 1991 at Hazeltine National Golf Club, where he defeated Scott Simpson in an 18-hole playoff. Stewart's second U.S. Open triumph occurred in 1999 at Pinehurst No. 2, where he held off Phil Mickelson by one stroke. These victories cemented Stewart's legacy as one of the most successful golfers of his generation.