Jack Draper overcame a slow start to beat Jenson Brooksby and reach the Indian Wells fourth round.
Britain's Draper was 4-1 down in the first set but found his rhythm to beat the tricky American 7-5 6-4 in 26C conditions in California.
Brooksby is now ranked 937 in the world as he makes his way back from a 13-month ban for missing three doping tests, and a lengthy shoulder injury.
The two embraced at the net after the match, with Draper writing "good to have a great player back" on the camera lens.
Draper, seeded 13th, will face either former champion Taylor Fritz or Chile's Alejandro Tabilo next.