Britain's Jack Draper needed just 55 minutes to win on his comeback at Indian Wells and set up a second-round match against compatriot Dan Evans.
Draper, 21, thrashed Switzerland's Leandro Riedi 6-1 6-1.
The left-hander had not played since mid-January when he lost to Spain's Rafael Nadal at the Australian Open.
Showing no signs of the leg injury which had kept him out, Draper looked sharp and confident as he dismantled 135th-ranked Riedi's serve.
Draper, ranked 56th in the world, broke in six of his seven return games as well as dominating on his own serve.