Northern Ireland's Rory McIlroy hits from the fourth tee during the third round of the 2011 U.S. Open golf tournament at Congressional Country Club in Bethesda, Maryland, June 18, 2011. (Xinhua/Reuters Photo)

US Open winner Rory McIlroy says his relationship with top-ranked tennis player Caroline Wozniacki can help him become golf's world No. 1.

McIlroy said he and Wozniacki "definitely spur each other on and it's very healthy." "She's No. 1 in the world and I've got a major and we sort of both want what each other have."

The 22-year Northern Irishman said he was impressed with Wozniacki's dedication, and can learn from her work ethic.

"You know, he has something I'm looking for and I have something he's looking for," Wozniacki told reporters at US Open.

"He wants to be No. 1. So it's good to have something on each other."