Daniil Medvedev was beaten by American teenager Learner Tien in five sets (Image: GETTY)
is out of the after losing to American qualifier Learner Tien in the biggest upset of the tournament so far.
The 28-year-old was taken all the way to a deciding set by his teenage opponent, with the match going on for nearly five hours and ending just before 3:00am.
Medvedev went into the contest as the overwhelming favourite but ended up on the receiving end of a massive shock as Tien produced the display of his life to claim the spoils.
He made a flying start to the match, winning the first two sets to stun Medvedev and put the experienced Russian on the brink of a straight-sets defeat.
It was at that point the tide began to turn, with Medvedev finally settling in and playing closer to his best. It resulted in the match going to a fifth set, which was disrupted by a rain shower with the score deadlocked at five games each.
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