MIAMI GARDENS, Fla., March 26 (UPI) -- Violent violet racket swipes and whistling sneaker squeaks sang in operatic harmony for thousands of fans trained on Coco Gauff this week at the Miami Open.

Fans continue to enjoy her best run at the tournament, with Tuesday's quarterfinal win as her latest exploit in Miami Gardens, Fla. But there is much more to her surge than pure talent, and her behind-the-scenes overhaul is far from finished.

The American continues to obsess with how she tosses the tennis ball, where she winds back her racket and how she lands as she tinkers with a refurbished serve -- while also wondering if she is the same player who won two Grand Slams.

But those who followed her galactic rise from a child prodigy in Delray Beach, Fla., to one of the sport's biggest stars are witnesses to a new and improved tennis phenom who was skilled enough to remain near the top of the tennis rankings despite a team makeover and battle with self doubt.

Gauff and her fans are now relishing the renascence.