Ex and drugs and clostebol: Nick Kyrgios' 'personal vendetta' against Jannik Sinner over failed doping tests and the 'second serve' jibe after World No 1 began dating his ex Anna Kalinskaya

When it comes to second serves, Nick Kyrgios is likely to be best remembered not for the tournament-best 143mph ace he hit at Wimbledon in 2019, but for a remark made on social media.

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