Del Potro, Zverev overcome colds to win at Shanghai Masters

Nikoloz Basilashvili won the China Open last week

Nikoloz Basilashvili won the China Open last week

Federer defeated Roberto Bautista Agut of Spain 6-3, 2-6, 6-4, a day after being taken the distance by Daniil Medvedev of Russian Federation.

"I feel like I'm where I want to be". I was a bit disappointed with my play there. "I served, I think, 80 percent in that second set and got broken twice".

Juan Martin del Potro and Alexander Zverev both defied illness to join Federer and Novak Djokovic in the next round.

He will face Spain's Roberto Bautista Agut for a quarter-final spot as he continues his quest for a third title in Shanghai.

Having lost a set for the first time in eight meetings with Bautista Agut, Federer cut down his errors before breaking in the ninth game en route to his 38th match win of the season.

Though the world No. 28 is a former finalist at this tournament, Federer was expected to storm through but he stuttered to a 6-3 2-6 6-4 win over the Spaniard.

"But I'm going like hour by hour and see how I'm feeling", added Del Potro, who plays 13th seed Borna Coric next in Shanghai. Del Potro had the knee wrapped but called it quits after losing the first set 7-5.

The Serbian second seed was stunned by the Italian-ranked 72 in the world at the time-in the French Open quarter-finals earlier this year.

A Masters event is a level below a Grand Slam, but Djokovic was rapt to crush Cecchinato.

"It's very important I won today after Beijing because it gives me a lot of confidence for a big match that I have", Basilashvili said. I did everything that I needed to win. The second set was ideal, really. The Serb is on a 15-match winning streak, which includes title runs at Cincinnati and the U.S. Open. He beat the Croatian 6-4 6-3 6-1 in the US Open fourth round last month.

In the breaker, it was Gasquet who was more solid of the two as he pushed a struggling Del Potro into long rallies, making him bail out of rallies and took a comfortable 6-2 lead.

Next up will be a tie with Nishikori, who defeated Sam Querrey in straight sets to keep his hopes of reaching the ATP Finals alive.

Anderson ousted 10th-seeded Stefanos Tsitsipas of Greece 6-4, 7-6 (1).

He will face the young, Aussie No. 1 Alex De Minaur who defeated the flamboyant Frenchman Benoit Paire easily in straight, 6-4, 6-3 sets.