Lleyton Hewitt held off Joao Sousa's late rally to reach the second round of the ATP Sony Open in Miami.
The former world No 1 twice failed to serve out for the match before claiming a 6-1 7-6 (7-3) victory over the Portuguese with his seventh match point.
"He played way better every time he was behind in the match," Hewitt told atpworldtour.com.
"Whenever he'd get back on serve in the second set, he actually played worse.
"When he was behind, he sort of just went for it a lot more. That was tough because he sort of had nothing to lose."