Royal Oath, who was making just his second start in North America, wore down a stubborn Ice Bear to capture the $309,400 King Edward Gold Cup by a half-length over 1 1/8 miles of yielding going at Woodbine.
Ridden by Patrick Husbands and trained by Mark Casse, Royal Oath settled in sixth place and was behind horses early but moved up to engage Ice Bear about three-sixteenths of a mile out and prevailed while bumping with that rival through a long drive.
Ice Bear held for second, a half-length before third-place finisher Seaside Retreat, who also hails from the Casse barn.