David Wheaton beat Andre Agassi 6-2, 0-6, 3-6, 7-6(3), 6-2 in the Wimbledon quarter-final, 1991 on grass
Wheaton would go onto lose to Boris Becker in the next round. This would be his sole Slam semi showing. Agassi would win the title the following year
Wheaton won 133 points, Agassi 130...