Alexander Zverev battles past Borna Coric to reach US Open semi-finals

Alexander Zverev needed to come back from a set down to beat Borna Coric 1-6, 7-6(5), 7-6(1), 6-3 and reach the semi-finals of the US Open.

In a less than enthralling match, the German was frequently visibly and audibly frustrated, particularly with his opponent's frequent need to leave the court and change his kit.

But he stepped up his quality in the final set, adding pace to his first and second serves, and cutting down on the proliferation of double-faults that had peppered his game earlier on.

Coric made a flying start to the match and needed only 24 minutes to wrap up the first set during which he took advantage of 12 unforced errors from a flat Zverev.

But the German showed plenty of fight in the second set as he came back from a break down and overcame four double-faults and 15 unforced errors to level the match by winning the tiebreak before unleashing an extended roar.

A fired-up Zverev was put to the test again in a pressure-packed third set where, after trading early breaks with Coric, he twice had to serve to stay in the set before going on to cruise through another tiebreak.

Zverev opened the fourth set in emphatic fashion as he sent a volley past Coric to take the opening game to love. He saved four break points in the fifth game for a 3-2 lead and then broke for a 5-3 cushion that sent him on his way to victory.