British number two Cameron Norrie beat American Zachary Svajda in straight sets to reach the Delray Beach Open second round.
Norrie, the 2022 winner, needed 90 minutes to seal a 7-5 6-4 win over the world number 169.
The players traded breaks of serve in a tight first set played in hot and humid conditions in Florida.
A powerful forehand down the line gave Norrie a crucial second break, with the 29-year-old comfortably holding serve to take the set.
With an equally tight second set level at 4-4, Norrie could not convert five break points in a mammoth eighth game before finally taking the sixth.
He then took the second of two match points on his serve to set up a second-round meeting with French second seed Arthur Rinderknech or Canada’s Gabriel Diallo.
