 On July 29, 2013, Wiebe won his maiden senior major at the Senior Open Championship at the Royal Birkdale Golf Club.He defeated Bernhard Langer on the fifth hole of a sudden-death playoff with a par, after both players finished the tournament at nine-under-par.Wiebe began the final round four shots back of Langer, but produced a four-under round of 66 to make the playoff, after Langer had double-bogeyed the final hole of regulation play.