Sunday 1 April 2018 22:16, UK
Big-hitting American John Isner demonstrated his perfect service technique in the final of the Miami Open against Alexander Zverev on Sunday.
Isner was looking to win the biggest title of his career on Sunday as he faced German fourth seed Zverev in the men's final.
And with an average first serve speed of 134 mph, Isner was demonstrating just how explosive and confident his game has been over the past week.
Sky Sports' commentator Mark Petchey explains Isner's execution of the serve with poise, technique, motion, and the all-important ball toss. Judge for yourself by clicking on the play button in the video above. It's poetry in shorts...
You can watch repeats of the ATP Miami Open final throughout the day on Monday and we'll be back for more tennis on Monday, April 16 for the start of the ATP Monte Carlo Rolex Masters with coverage underway from 9.30am on Sky Sports Arena.
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