Thiem was five points away from closing it out in the third set, holding a break point with Gaston serving at 4-all, 30-40, but the 20-year-old Frenchman held and eventually snuck out the set.

Gaston won the fourth set, too, and after the first seven games of the fifth went to the server, Thiem broke one last time for a 5-3 lead and served it out, clinching victory after three hours and 32 minutes.

“I missed one break point at two sets to love and 4-all. At that point the match changed,” Thiem said. “I was losing a bit of energy—but in the fifth set I found new energy. It was a great fight until the end.

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“I’m very lucky I made it through today.”

The Austrian was asked in his on-court interview about the No. 239-ranked Gaston, who wasn’t just playing the second week of a major for the first time, he was also the last Frenchman left in the draw.

“Such good fighting qualities,” Thiem said. “I haven’t seen a player for a very long time with such big touch in his hands—I mean, his drop shots are from another planet. If he continues like this, he’s going to be a huge, huge player, and he’s going to make a lot of joy in this stadium in the future.”

Gaston had taken out No. 16 seed and 2015 Roland Garros champion Stan Wawrinka in the third round.

11 IN A ROW: THIEM BATTLES TO LONGEST WINNING STREAK OF CAREERCorinne Dubreuil / FFT

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