American Bethanie Mattek-Sands, currently ranked no. 197 in the world after an injury plagued 2012 season, upset second seed and defending champion Su-Wei Hsieh in the quarter finals of the WTA BMW Malaysian Open on Friday to advance to the semi-finals - her best result in singles on the tour for a while now.
The American, once ranked inside the top 40 in the singles rankings, upset her Taiwanese opponent 7-5, 6-2.
Meanwhile, third seeded Russian Anastasia Pavlyuchenkova shrugged off her struggles form earlier this week, to easily dismiss 16 year old Australian Ashleigh Barty 6-2, 6-0. Barty was playing her first WTA quarter final. The Russian, who saved matchpoints in her earlier rounds, started the season well by reaching the finals in Brisbane but then went on a four match losing streak until this week.
Also advancing to the last four were fourth seed Ayumi Morita and 20 year old Karolina Pliskova. Pliskova also lost in the doubles semi finals on Friday with her twin sister Krystina.
 Ayumi Morita (JPN) d Luksika Kumkhum (THA) | 6 (7) - 7 | 6 - 4 | 6 - 1 |
[3/W] Anastasia Pavlyuchenkova (RUS) d Ashleigh Barty (AUS) | 6 - 2 | 6 - 0 |
Karolina Pliskova (CZE) d Patricia Mayr-Achleitner (AUT) | 7 - 5 | 6 - 1 |
Bethanie Mattek-Sands (USA) d  Su-Wei Hsieh (TPE) | 7 - 5 | 6 - 2 |