The young teen Cori Gauff who progressed to the second round of Wimbledon Championship 2019 after beating experienced player Venus Williams in last battle, has created havoc with her performance at the Centre Court.
That was followed by a win against 2017 Wimbledon semifinalist Magdalena Rybarikova, who is 30.
Still, Gauff said she is staying grounded in the face of her sudden fame.
Having regained her poise to hold serve and lead 6-5, Hercog pressed on the opening point of the Gauff serve.
How she's able to get to that mentality in her first-ever Grand Slam main draw is anyone's guess, but, while another breakout star, Bianca Andreescu, is dedicated to a pre-match practice of "creative visualization", Gauff's strategy is quite different. She oozed calm self confidence and maturity, delivering powerful serves, accurate ground strokes, and forceful returns.
The hangover of that continued into the second set as Hercog sealed a third successive break, with Gauff's forehand regularly faltering.More news: Bahamas police: Seven Americans dead in helicopter crash
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She broke Hercog's serve when she had no other option and then finally battered down the obdurate defence of her opponent's backhand slice to take a thrilling tie-break 9/7. They also have the largest capacity.
Last year's runner-up at Wimbledon came up against the same player who eliminated the previous runner-up at Wimbledon.
"I'm not going to think about the next round but I think I have a mixed doubles match tomorrow so I'm going to focus on that".
In the third set, the South African had a break point at 2-1, two more at 3-2 and another one at 4-3, but couldn't convert any of them. "Even when I was down match point they were still cheering me on". The Dane repeatedly grew frustrated with the result of Hawk-Eye challenges, complaining to the chair umpire on several occasions that the calls made by the review system were wrong.
After Gauff's aggressive style paid off there, it was Hercog who really went into a shell, playing so cautiously and making mistake after mistake.
The two-time Grand Slam champion was leading 3-1 in the first set, but then lost 11 of the next 12 games as she hit 33 unforced errors in a comprehensive 6-3 6-1 defeat.
Defending men's champion Novak Djokovic faces Hubert Hurkacz earlier in that arena.