ATP finals: Djokovic knocks out Zverev, reaches semifinal

The top-ranked Djokovic set up a match against Dominic Thiem on Saturday as he goes for a record-tying sixth title at the season-ending event.

Novak Djokovic knocked out Alexander Zverev to reach the semifinal of the ATP tournament in the O2 arena.

Novak Djokovic advanced to the semifinals at the ATP Finals and eliminated Alexander Zverev on Friday by beating the German 6-3, 7-6 (4) in an empty O2 Arena.

The top-ranked Djokovic set up a match against Dominic Thiem on Saturday as he goes for a record-tying sixth title at the season-ending event, and a first since 2015.

Rafael Nadal will take on Daniil Medvedev in the other semifinal match.

Bouncing back from a straight-set loss to Medvedev on Wednesday, Djokovic broke Zverev to take a 2-0 lead in the first set when his opponent double-faulted on the second break point.

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Djokovic saved two break points at 4-2 before clinching the set with a backhand down the line as he closed in on the net following a serve out wide.

Zverev posed more problems for Djokovic in the second set, and led 2-0 in the tiebreaker. Djokovic then won five of six points and, on his first match point, sent a deep and penetrating forehand that Zverev could only slice into the net on the stretch.

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Djokovic reached the semifinals of the event for the ninth time.

Medvedev will be going for a third straight group victory when he plays already-eliminated Diego Schwartzman in the late match.