Serena Williams celebrated her US Open second-round victory over Kiki Bertens by heading straight to the practice court to fix her misfiring serve.
Despite beating Bertens 7-6 (7/5) 6-3, Williams was unhappy with her display and spent more than 30 minutes working with coach Patrick Mouratoglou shortly after the match.
The American was determined to improve her service, which had yielded 10 double faults and was broken by Bertens twice during the contest.
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"Patrick told me some things that he saw that he thought I could work on to improve it and to get better," Williams said.
"I've gone out to the practice courts after matches often enough. I've done it a few times, so it's nothing new actually - for me at least."
Williams has made a habit this year of performing dramatic comebacks and she managed another on Arthur Ashe, fighting from 5-3 down and then 4-0 behind in the tie-break to clinch the first set.
The world number one came from a set down to win four times en route to the French Open title this year and memorably overturned Heather Watson's 3-0 final-set lead at Wimbledon.
"Today, I just said, 'one point at a time'," Williams said.
"When I get down, I tend to get really relaxed and I start to play a little better.
"I've always made some legendary comebacks since 1998 when it first started. So that's kind of just been my MO for my whole career."
Williams is now five wins away from becoming the first player since 1988 to hold all four grand slam titles in a single year.
She would also become only the fourth female player in history to achieve the feat and admits she felt nervous in round two.
"Until today I was okay with it. I just got a little nervous today," Williams said.
"But I've been doing totally fine. I've been completely relaxed, chilled.
"I've been really, really fine so I'm going to get back into the place that I was and I'll be fine again."
Fellow American Bethanie Mattek-Sands now awaits in the third round after the wildcard upset the odds by thrashing Coco Vandeweghe 6-2 6-1.
Mattek-Sands is known for her doubles, as well as her eccentric personality off-court, but Williams insists the world number 101 represents a tough test.
"I love her personality. It really shows in her dresses and the clothes and the outfits. I love her spirit," Williams said.
"She's going to give 300 per cent. She's a huge fighter. She has a great game, by the way.
"I know that will help me, that I have to start out strong if I want to stay in the tournament. If not, I can go on vacation."
Joining Williams in the third round is another American in Madison Keys, who overcame Tereza Smitkova 6-1 6-2.
Canada's Eugenie Bouchard is also through after she managed a second consecutive victory for the first time since March, beating Polona Hercog 6-3 6-7 (2/7) 6-3.
Switzerland's Belinda Bencic, who beat Williams in Toronto earlier this month, pulled off a stunning fightback as she saved three match points before defeating Japan's Misaki Doi.
With tears streaming down her face, Bencic looked down and out at the end of the second set when she slammed her racket into the ground and castigated the umpire for ordering a point to be replayed.
The decision helped Doi open up three match points but Bencic saved them all before clinching the set and finally the match 5-7 7-6 (7/3) 6-3.
"I was a little bit emotional. Just a bit," Bencic said. "I 'm just happy I could turn it around. It was a crazy match."
Bencic will now face Venus Williams, who battled to a 6-3 6-7 (2/7) 6-2 victory over fellow American Irina Falconi.
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