A gureling four-hour contest. Rublev struggled to hit through Fucs, who wisely thwarted him with slices, and since neither player was great with dropshots or volleys (though Marton made a few great droppers but rarely so), the bulk of play consisted of attrition rallies as Rublev sought to overpower while Fucs worked to outlast, but got wobbly every time he led, like Querrey. Meanwhile, Rublev's mental strength has been very impressive recently. Today, he trailed 2-5 in the second set, 1-3 in the third and was down *4-5 0-40 in the fourth, yet managed to win all those sets. Tsitsipas looks to be the clear favourite in QF but you never know with the youngsters.