British number one Katie Boulter recovered from a set down to beat Irina-Camelia Begu in the second round at Indian Wells.
The Romanian won the first set in a tie-break but Boulter then took charge to win 6-7 (2-7) 6-3 6-0 in California.
Boulter, 28, is playing just her third tournament of the year and had a bye in the first round while Begu, ranked 74 in the world, beat Ann Li of the USA.
The Englishwoman will face a much sterner test in the third round when she faces Kazakhstan's Elena Rybakina, the seventh seed.