Serbia's Jelena Jankovic breezed past Romania's Sorana Cirstea 6-2, 6-1 in just over an hour to reach the semi-finals of the WTA Tour's Texas Open on Wednesday.
The second-seeded Jankovic dominated Cirstea by winning 79% of her first-serve points to book a spot in the next round against qualifier Casey Dellacqua of Australia.
The eighth-seeded Cirstea committed seven double faults and won just 19% of her second-serve points in the match played on the main stadium courts.
Dellacqua also won her match in straight sets, beating Canada's Aleksandra Wozniak 6-4, 6-4.
Dellacqua won 68% of her first-serve points and hammered two aces in the 67-minute match.
In other action, Italy's Roberta Vinci, the third seed, eliminated Chanelle Scheepers of South Africa 7-6 (7/1), 6-2 to reach the semi-finals.
Vinci next faces Bojana Jovanovski who was leading 6-4, 1-0 when China's Peng Shuai retired from their match early in the second set.