British number one Cameron Norrie shook off illness and an early setback to beat South Korean Kwon Soon-woo to reach the Madrid Open second round.
Norrie, 26, was broken in his opening service game and trailed 4-1 in the first set, saving two set points before winning 7-5 7-5 against the qualifier.
"I've been a little bit sick, I sound like I've just smoked a packet of ciggies," said Norrie, who faces American John Isner next.
"But I'm feeling better every day."
He told Amazon Prime: "I was happy to even play here this week and was just fortunate to get a win like this against Soon-woo, who was confident and playing well.