Medvedev led 4-3, 30-30 in the second set when he surprised Zverev with a quick underarm serve. It brought the German to the net and he lost the point when his backhand block volley flew long.

But if it doesn’t go to plan, questions are asked. Alejandro Davidovich Fokina opted for an underarm serve at a crucial point in his third-round Wimbledon match against Holger Rune on Saturday.

From the off, Draper was clearly discomfited by Davidovich Fokina’s quirky game style, which relied heavily on drop shots and a punishing backhand ... tossing in an underarm serve at 8-8.