Djokovic joins Nadal in Qatar Open semis

DOHA, Qatar — Top-seeded Novak Djokovic survived a second set challenge to dismiss eighth-seeded Leonardo Mayer of Argentina 6-3, 7-5 to reach the Qatar Open semifinal Thursday.

Mayer made four unforced errors when serving for the second set at 5-4 which opened the door for Djokovic to take a straight-set victory.

He will play Tomas Berdych in the semifinals against whom he has a 21-2 winning record. Berdych, of the Czech Republic, beat Kyle Edmund of Britain, 6-3, 6-2.

“I think I’ve played better first and second sets, but credit to him for being solid and going for his shots,” Djokovic said. “The second set was very close and it could’ve gone his way. It was a good test to see where I am.”

Despite being broken four times, second-seeded Rafael Nadal advanced to the semifinals with a 6-3, 5-7, 6-4 win against Andrey Kuznetsov of Russia.