But the injury changed the course of the match, even though an ill Bouzkova resulted in a tie-break in the second set. Jabeur broke early in the final set and then served for the match in the ninth game.
Another turning point came when Bouzkova saved two match points after trailing 15–40, but Jabeur eventually won on her third match point.
Jabeur, who will now face China’s Zheng Qinwen in the last 16 on Monday, said her punishing training in Tunisia has helped prepare her for the demands of the tournament.
“It was very hot in Tunisia, very humid,” Jabeur said. “To be honest, I was struggling to finish the practice. It would have been very easy to stop the practice, but we didn’t.
“I was really fighting in those drills just like during those matches.”