INTERNATIONAL: Olympic champion Alexander Zverev was awarded a win in his opening match of the ATP Finals. This was after Italian Matteo Berrettini pulled out injured early in the second set with the German leading 7-6 1-0.

World number three Zverev was made to work very hard against Berrettini for more than an hour before the Italian pulled out injured.

Berrettini had struggled to hold serve, having to save two break points on his very first service game alone, but his forehand repeatedly got him out of trouble.

Another two dizzying forehand crosscourt winners earned him his first two break and set points at 6-5 but he could not convert either.

Zverev also squandered two set points before clinching the tie break on his third chance after an hour and 19 minutes.

But after a game into the second set Berrettini needed a medical break for on-court treatment to his abdominal muscles and lasted only one more point before pulling out in tears.

^{PHOTO: HIGHLIGHTS OF ALEXANDER ZVEREV V MATTEO BERRETTINI IN THEIR OPENING MATCH OF THE ATP FINALS WITH BERRETTINI RETIRING DUE TO INJURY}