Lee Duck-hee became the first deaf player to win an ATP main draw match, waiting out a rain delay to beat Henri Laaksonen in Winston-Salem, North Carolina.
The 21-year-old from South Korea was two points from victory when thunderstorms swept through the area. When he and Switzerland's Laaksonen returned some five hours later Lee quickly polished off a 7-6 (7/4), 6-1 victory on Monday.
"I never expected to get through this one," said Lee, who had won the final three points of the first-set tiebreaker.
"I thought that I was just going to do my best and try to stay focused, but I came out a winner."