World number one Iga Swiatek overcame a slow start to defeat Czech teenager Linda Noskova in straight sets and reach the fourth round at Indian Wells.
The Polish 22-year-old, a four-time major winner, trailed 4-2 in the first set and faced three break points in a pivotal seventh game.
But she won 10 successive games from that point to earn a 6-4 6-0 victory.
Swiatek, who lost to Noskova at the Australian Open, will play Madison Keys or Yulia Putintseva in last 16.
The 19-year-old Noskova, who came back from a set down to stun Swiatek in the Australian Open third round in January, looked in firm control as she led 15-40 on her opponent's serve when already 4-2 ahead in the opening set.