Oct 3 (Reuters) - Pairings for Friday's opening foursomes matches in the 10th Presidents Cup between the United States and the Internationals being played at Muirfield Village Golf Club in Dublin, Ohio (U.S. pairs first): 1310 local (1710 GMT): Phil Mickelson/Keegan Bradley v Jason Day (Australia)/Graham DeLaet (Canada) 1321: Bill Haas/Hunter Mahan v Ernie Els (South Africa)/Brendon de Jonge (Zimbabwe) 1332: Steve Stricker/Jordan Spieth v Branden Grace (South Africa)/Richard Sterne (South Afr
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