Oct 2 (Reuters) - Pairings for Thursday's opening fourball 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): 1145 local (1545 GMT): Hunter Mahan/Brandt Snedeker v Jason Day (Australia)/Graham DeLaet (Canada) 1157: Bill Haas/Webb Simpson v Adam Scott (Australia)/Hideki Matsuyama (Japan) 1209: Phil Mickelson/Keegan Bradley v Louis Oosthuizen (South Africa)/Charl Schwartzel (South Af
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