You might remember underarm serves from PE lessons in primary school, but Jared Donaldson broke out the basic move on the biggest stage.
The 21-year-old, from the US, was engaged in a titanic fifth set against fourth seed Grigor Dimitrov in the second round at the French Open, when cramp set in.
In an effort to combat the effects of what became a four-hour match, Donaldson called on an alternative tactic.
Furthermore, it worked. Dimitrov’s return was long and Donaldson held serve to go 7-6 in front in the final set.
Dimitrov eventually prevailed 10-8 in the decider, however, with the match ending after 259 minutes.
Will Wimbledon-goers witness the energy-saving tactic at SW19 next month?