15-year-old American Gauff's US Open run ends against Osaka

"I'm going to learn from this whole match," Gauff said. "She's been so sweet to me."

Osaka's advantages in age — she's 21 — and accomplishments — she is a two-time major champion, including at the Australian Open this January — played a role. So, too, did her on-target power, which resulted in a 24-8 edge in winners.

"For me, this is the most focused I've been since Australia," said Osaka, who's had an up-and-down season since earning that trophy.

Addressing Gauff, she said: "I'm so sorry for playing you (with) this type of mentality."

When it ended, after merely 65 minutes, Gauff began to bawl on the sideline. Osaka approached her and they spoke, briefly. They're both based in Florida now and have known each other for a few years. Their fathers are friends.

"I've watched her play for so long," Osaka said. "I thought I had to get going right off the bat."

AP