"Next time, you need to tell me before I serve the ball," Coco Gauff told the chair umpire, sounding like someone playing her 10th, or at least her fifth, Australian Open—certainly not her first. "Because I'm not looking at her."

Gauff was serving down 3-4 in the deciding set of her second-round match against Sorana Cirstea. Her opponent putting her racquet up to indicate she was not ready to return would not be enough to penetrate Gauff's laser focus on the task at hand.

"First serve?" she asked before executing a serve-backhand-volley combo to win the point. "COME ON!" she screamed, at an intensity that would impress even Serena.

"The ones who are the great ones, they don't really fear anyone," she'd said after her first-round victory versus Venus Williams, her second straight-sets win over her in as many attempts. "They respect your opponent, but you can't go into the match fearing someone. Because then you're gonna lose, and I don't wanna lose."

In Round 2, Gauff did not lose. She was two points away from being sent home, but she took charge with a hard second serve at Cirstea's shoulder that would go unreturned.

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In the minutes that followed, Gauff held her serve and then broke Cirstea's with an overhead smash for a 6-5 lead. She emphatically punched the air. If she yelled, it couldn't be heard over the roar of the crowd.

With swooping forehand strokes and more strong serves, Gauff served out the match to complete the 4-6, 6-3, 7-5 comeback, setting up a third-round rematch with defending champion Naomi Osaka.

"This time coming in, I'm going to be more aggressive," Gauff said. "For sure [I'll be] more confident because I felt her ball before."

She's being rewarded for a preseason training that saw her working out with the likes of Serena Williams. Off the court, her off-season included another milestone: the 15-year-old "finally" got her learner's permit.

"I would show you but I don't have it on me," she said. "My mom has it because I almost lost it here. I don't know why I brought it to Australia with me."

"My dad lets me drive more than my mom," she added. "But my mom, I try to force her to let me drive. I need practice. When I'm 16 and I get my license, I'm going to be going to Chick-fil-A and everywhere without my parents."

Regardless of whether Gauff's able to actually beat another multiple–Grand Slam champion on Friday, she'll be attempting it with far less fear and far more self-belief than anyone who just got their learner's permit ought to have.