This trio of women's tennis players uses underhand serves to their advantage | The Daily Pennsylvanian
Nadal furious after bad boy Kyrgios tries underarm serve in shock win over Spaniard | The Sun
What's Wrong With an Underhand Serve in Tennis?
Tennis Is Opening Up to Underhand Serves - The New York Times
2019: Year of the Underarm Serve - YouTube
Underhand Tennis Serve: Rules with Serving Underhand | USTA.com
Viewpoint: The Underhand Serve Tactic
Nick Kyrgios's underarm serving a rebellious act with echoes of Lenglen | Tennis | The Guardian
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
Tennis skills: the underarm serve
The significance of the underarm serve in lawn-tennis
Nick Kyrgios was right – more players should serve underarm against Rafael Nadal
Rafael Nadal to blame for underarm serve trend, says Nick Kyrgios - Tennishead
Kyrgios and the Underarm Serve Dropshot | Prodigy Maker
Players whip out underhand serves in Paris
Controversial underarm serve proves popular tactic at French Open