Everything you need to know about speed in tennis

Medvedev stunned by Opelka in St Petersburg

Opelka fights back to oust top seed Medvedev at St. Petersburg Open

US Open: Kvitova laments empty stands, Goffin sees it as an 'advantage'

Opelka, Garin continue fine form with second ATP Tour titles

Schwartzman survives epic against Cuevas, Opelka's title defence over in New York

New York Open: Thompson stuns top seed Isner, Opelka kicks off defence with win

Isner, De Minaur move through in Cincinnati

Atlanta Open: Reilly Opelka ends John Isner's title defence

Wimbledon: Wawrinka suffers shock defeat to Opelka

Gender and fair play in sports

Reilly Opelka claims maiden ATP title in New York

Schnur's dream run continues, Opelka outguns Isner again