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GTC: Mackay: Sunday 66 Mickelson's best round ever

Days removed from victory at Muirfield, caddie Jim "Bones" Mackay asserted that Sunday's 66 was Phil Mickelson's best round of all time.
/ Source: NBC Sports

Days removed from victory at Muirfield, caddie Jim "Bones" Mackay asserted that Sunday's 66 was Phil Mickelson's best round of all time.