Britons Heather Watson and Katie Boulter lost the first round at Indian Wells.
Watson, battled early in set one but failed to take two break points at 2-2 and Tereza Martincova pushed on to a 6-2 6-1 win.
Boulter, was broken three times in her opening set against Italy’s Jasmine Paolini and lost 6-3 6-2.