Serena Williams, who will take over No. 1 in the world tennis rankings Monday, defeated Maria Sharapova on Saturday to advance to the finals of the Qatar Open.
Williams, who will become the oldest woman to hold the top ranking, will now play the woman she's replacing atop those rankings, Victoria Azarenka, in the championship match Sunday.
Sharapova didn't put up much opposition on Saturday, with Williams defeating the Russian, 6-3, 6-2.
Azarenka, who has beaten Williams only once in 11 meetings, defeated Agnieszka Radwanska, 6-3, 6-3, in the other semifinal.
Williams, who has been hampered by a sore ankle she injured last month at the Australian Open, said her game is improving as the tournament progresses.
“Definitely the best I played," she said. "I had to play better. I'm playing a player [Sharapova] that's very consistent, doesn't lose often, just usually in finals and semis. So I had to be on my game today.”
Williams will replace Chris Evert, who was 30 when she was No. 1 in 1985, as the oldest top-ranked woman. She secured that feat by beating former Wimbledon champion Petra Kvitova in the quarterfinals on Thursday.