Britain's Emma Raducanu overcame a build-up disrupted by injury and illness to earn a gutsy first-round win at the prestigious Indian Wells event.
Raducanu, 20, was unsure she would be fit enough to play because of a recurring wrist injury, but won 6-2 6-3 against Montenegro's Danka Kovinic.
The 2021 US Open champion, ranked 77th, faces Poland's Magda Linette next.
Fellow Briton Jack Draper needed just 55 minutes to win his opener, setting up a meeting with compatriot Dan Evans.
Later on Thursday, Andy Murray aims to join the pair in the second round of the BNP Paribas Open, which is one of the biggest events outside of the four Grand Slam tournaments.