Caroline Wozniacki moved to within one victory of regaining the No 1 ranking after beating Japan's Ayumi Morita 6-1, 6-0 to reach the quarter-finals of the Dubai Championships.
The 20-year-old Dane, who lost the top spot to Kim Clijsters on Monday, was never seriously challenged by the 57th-ranked Japanese qualifier.
She now must beat Shahar Peer of Israel to return to No 1.
Wozniacki lost to Peer in the third round last year.
Tennis: Wozniacki nears top spot
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