The last time Novak Djokovic and Stefanos Tsitsipas met, it was in the semifinals of Roland Garros last fall.
And Tsitsipas pushed the world No. 1 to a fifth set before fading, as he tried to reach his first career Grand Slam final.
(He’s still trying).
But since then, the 22-year-old from Greece has notched his first career Masters 1000 title. And has had some big results on this spring clay-court swing.
So Djokovic might have an even bigger challenge when they play their quarter-final match Friday.