Top seed Simona Halep came from 5-3 down in the opening set to win 10 games in a row and beat China's Saisai Jheng to reach the third round at Wimbledon.
With five of the top eight women's seeds eliminated, the Romanian, 28, looked in danger of joining them when she made a slow start.
But once she got into her stride, she was unstoppable against the world number 126, winning 7-5 6-0.
Next up for the world number one will be Su-Wei Hsieh of Chinese Taipei.
"I stopped missing and tried putting less power on the shot to make her run," Halep told BBC Sport.