British number one Jack Draper began his Wimbledon bid with a commanding performance before his opponent Sebastian Baez retired through injury.
Draper, who is seeded fourth after a stunning rise over the past 12 months, was leading 6-2 6-2 2-1 when Baez retired after one hour and 14 minutes.
Clay-court specialist Baez needed treatment in the second set after slipping on the Court One baseline.
"I wanted to play a bit longer in all honesty. I felt I was getting my tennis together," said Draper, who recorded only his third main-draw win at the All England Club.