Andy Murray pulled off an underarm ace against 18-year-old rival Carlos Alcaraz Garfia at Indian Wells.
Britain fought from a set back to win the match and will now take on world number three Alexander Zverev on Tuesday.
But Murray’s victory wasn’t the only thing that caught the attention of tennis fans.
The 34-year-old pulled off a cheeky underarm ace, causing Garfia to flatfoot a few yards behind the baseline.
Murray received a mixed reaction on the stands and on social media.
Some cheered cheeky tactics, while others booed loudly.
But what Murray did was completely legitimate and Is The first was used in major tournaments.
One viewer said on Twitter: “Big man hitting underarm serves LMAO. Shame something that’s for kids @andy_murray.”
Others have called Murray’s move “unethical”.
Another said: “I don’t understand why professional tennis players are required to use an underarm serve.
“It may be a legal rule, but it’s immoral and unsuitable for tennis. Feels like plagiarism to me…”
Murray defends his actions and hints that he may use it again.
Murray said: “Yeah, well… I mean… he started to come back and stand back for the first time and, I mean, the courts here are very slow.
“I wasn’t getting enough points on my first serve.
“I hit three aces throughout the match and one of them was an underarm serve…
“I was thinking of using it again in the third set but I didn’t but yeah first time I’ve done it in a match and got an ace maybe I’ll try it again in the future if people stand So far behind.”
Michael Chang was the first slick tennis star to deploy the skill back in 1989.
The 17-year-old American at the time pulled it off against world No. 1 Ivan Lendl at the French Open.
Chang defeated Lendl and went on to win the competition, becoming the youngest men’s Grand Slam champion – a record that still holds today – and America’s first French Open winner since 1955.
Murray isn’t the only modern tennis star to have used Chang’s underarm serve.
Bad boy Nick Kyrgios pulled it back against legend Rafael Nadal at Wimbledon in 2019.
The crowd loved it, Kyrgios stood up straight, and Nadal couldn’t help but crack a smile.
i was thinking of using it again in the third set but i didn’t but yeah first time i have done it in a match and got the ace maybe i will try it again in the future if people stand far behind.
Nadal, however, took his revenge, beating the Australian one in three sets.
Daniil Medvedev also pulled it off against Zverev in the ATP Finals last year.
Medvedev did not get the ace, but he won the points in the end.