Table:
text: Payne Stewart
Professional wins (24)
PGA Tour wins (11)
No_ Date_ Tournament Winning_score Margin_of_victory Runners_up_
7 May 6, 1990 GTE Byron Nelson Golf Classic −8 (67-68-67=202)^ 2 strokes Lanny Wadkins
8 Jun 17, 1991 U.S. Open −6 (67-70-73-72=282) Playoff Scott Simpson
9 Apr 30, 1995 Shell Houston Open −12 (73-65-70-68=276) Playoff Scott Hoch
10 Feb 7, 1999 AT&T Pebble Beach National Pro-Am −10 (69-64-73=206)^ 1 stroke Frank Lickliter II
11 Jun 20, 1999 U.S. Open −1 (68-69-72-70=279) 1 stroke Phil Mickelson

Question: How many times has the US Open been tournaments under Payne Stewart in total?