Aljaz Bedene became the first Briton to reach round two of the French Open with a comfortable win over Ryan Harrison.
The British number three won 6-4 6-0 3-6 6-1 against the American who is 10 places higher in the rankings at 42.
Bedene, 27, who lost to Novak Djokovic in the third round last year, will play Jack Sock or Jiri Vesely next.
Fellow Britons Andy Murray, Kyle Edmund and Johanna Konta start their challenge on Tuesday, but Dan Evans lost on Sunday.
Bedene has impressed on clay this year, winning two titles on the second-tier Challenger circuit and reaching on ATP Tour final in Hungary, and continued that form winning in one hour and 59 minutes.