Height offers tennis players a significant edge in serving, with towering players like Reilly Opelka and Giovanni Mpetshi ...

For every tennis player, the perfect serve is the holy grail ... rhythm and, above all, technique of their service actions to enable it to hold up under even the most severe pressure.

(SOUNDBITE OF ARCHIVED RECORDING) UNIDENTIFIED SPORTSCASTER: Fans groaning - another missed first serve ... to perfect a technique known as the Continental grip. In tennis, changing your mechanics ...