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Nick Kyrgios Underarm Serve Compilation | "Nick Kyrgios and the underarm serve" One of tennis' most talked-about stories over the past year... | By Tennis TV | Facebook
What's Wrong With an Underhand Serve in Tennis?
Nick Kyrgios: Andy Murray's mum Judy joins Miami Open underarm serve row - 'He's a GENIUS' | Tennis | Sport | Express.co.uk
Controversial underarm serve proves popular tactic at French Open
Fresh Takes: The infamous underhand serve
The Easiest, Riskiest, Most Controversial Shot in Tennis - WSJ
Nadal furious after bad boy Kyrgios tries underarm serve in shock win over Spaniard | The Sun
French Open Underhand Serve Trending Thanks to Star Who Hates Tennis
Underhand Tennis Serve: Rules with Serving Underhand | USTA.com
Is an underarm serve really that effective for Nick Kyrgios? Maths professor finally reveals the truth - Tennishead