DOHA, Qatar, Oct. 29 (UPI) -- Serena Williams beat Elena Dementieva 6-2, 6-4 Thursday, earning a semifinal berth at the season-ending Sony Ericsson Championships at Doha, Qatar.
Williams, who will retake the world No. 1 spot when the new rankings are released Monday, is 3-0 in the round-robin segment of the tournament, fueled by a six-game winning streak after the fifth-seeded Dementieva, a Russian Olympic gold medalist, took a 2-1 lead in the first set.