Britain’s Heather Watson, Katie Boulter and Harriet Dart moved to the second round at the Indian Wells.
Watson, who reached the last 16 in 2015, beat Spain’s Rebeka Masarova 7-5 6-2 in California.
Boulter, beat China’s Xinyu Wang 6-7 (8-10) 6-4 6-4, while Dart beat the Netherlands’ Lesley Kerkhove 6-1 7-5.