Marco Cecchinato recovered from 1-4 down in a final-set tie-break to defeat Chung Hyeon 4-6 7-6 (7/5) 7-6 (7/5) in two hours and 35 minutes while British number one Kyle Edmund maintained his good recent form with a 6-3 6-4 win over Andreas Seppi to reach the third round in Shanghai for the first time.
Three days on and the 30-year-old continues to be under the weather, but just about did enough to see off France's Richard Gasquet in Shanghai, 7-5, 7-6 (9/7).
But the world number three exploded back to life in the northern hemisphere summer, winning Wimbledon, the Cincinnati Masters and US Open. "I played a solid match".
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.
"It really was a long day, a long wait, at some point I thought I was maybe not going to play", said the relieved fourth seed, after winning 6-2, 6-1.
Others, while condemning Verdasco's behaviour, pointed out that he is by no means the first tennis player to treat a ball kid harshly.
The match ended with a score of 3:6, 6:0, 6:3. "At this point in my life, I want to do what I really like to", said Federer. "I do not want to paint myself as a ideal person".
Zverev has been suffering with a cold but ratcheted up the pressure to grab the all-important break of serve in the ninth game before closing out the match against de Minaur, who this week replaced Nick Kyrgios as Australia's top-ranked player.
Wang Qiang, 26, and Zhang Shuai, 29, said confidence was now growing among Chinese players after a quiet spell since trailblazer Li Na, a two-time major-winner, retired in 2014.
"When she won the Grand Slams I think more people chose to try tennis and try to believe in themselves".
"If you want to make the victor you have to take a lot of risks, it seems like. So all this stuff, it's quite hectic to be quite honest, even though it seems like we have a lot of time", he said on Tuesday. Lendl is due to return to the tour before the end of the season.
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