Caroline Wozniacki and Angelique Kerber discuss their frequent use of the moonball in the Dane’s 2-6, 6-4, 7-5 victory in the semifinals of Indian Wells. It is the first time since the 2011 Indian Wells tournament that Wozniacki has reached the final of a WTA Premier Mandatory event.

Kerber said that Wozniacki’s use of the shot might have turned the tide of the match.

“Maybe a little bit because I was not expect these balls,” she said. "Yeah, maybe, but I don't know.

"I try to play the point. Doesn't matter if it's high or if it's flat. It's a different style of game, but it's tennis."

Wozniacki added: “I just took it as it came. I was trying to figure out a way to win. And it doesn't really matter how, you know. It's just important to win the points basically. I felt like I got some nice points out of it, and I felt like I could go from defense to offense that way, as well.”