Miami - World number two Li Na posted a 7-5, 7-5 victory over 11th seeded Caroline Wozniacki in the quarter-finals of the WTA and ATP Miami Masters tournament on Wednesday.
China's Li won 63 percent of her first serve points and 79 of 150 total points in the match which lasted just over two hours.
Li advances to the semi-finals where she will face Dominika Cibulkova of Slovakia who beat Agnieszka Radwanska in three sets earlier in the day.
Cibulkova is winless in six career meetings against Li, including a loss in the final of this year's Australian Open.
Thursday's other semi-final sees world number one Serena Williams against fourth-seeded Maria Sharapova.
The American defeated Sharapova in last year's final to capture a sixth Miami title, sending Sharapova to her fifth loss in five finals.Results on Wednesday from the ninth day of the WTA and ATP Miami Masters (x denotes seeded player):
Novak Djokovic (SRB x2) bt Andy Murray (GBR x6) 7-5, 6-3
Kei Nishikori (JPN x20) bt Roger Federer (SUI x5) 3-6, 7-5, 6-4
Dominika Cibulkova (SVK x10) bt Agnieszka Radwanska (POL x3) 3-6, 7-6 (7/5), 6-3
Li Na (CHN x2) bt Caroline Wozniacki (DEN x11) 7-5, 7-5