JOHANNESBURG (AP) Serena Williams says it's ``a matter of time'' until she's No. 1 again.

Williams says her fifth Wimbledon title was the highlight of her year. She also won an Olympic gold, the U.S. Open and the season-ending WTA Championships.

The No. 3-ranked Williams says she'd ``rather have Grand Slams and victories'' than the top ranking.

``I've been No. 1 before and believe me, I'll be No. 1 again. It's just a matter of time.''

The winner of 15 Grand Slam titles finished the year No. 1 in 2002 and 2009.

Serena and sister Venus arrived in Johannesburg on Saturday on their two-nation tour of Africa. On Friday, Venus defeated Serena in an exhibition match in Lagos, Nigeria.

Serena promised she'd be going ``all out'' when they play in Johannesburg on Sunday.