New Delhi, Aug. 4 -- Fourth-seeded Ben Shelton of the United States rallied in the third set to beat 13th-seeded Flavio Cobolli of Italy 6-4, 4-6, 7-6 (1) on Sunday night in the National Bank Open.

Shelton overcame a 4-2 deficit in the final set to advance to the quarterfinals Tuesday in the hard-court event that ends Thursday.

"Really difficult match. I was down and out, being a break down in the third, the way that he was playing," Shelton said. "I gave myself a second chance and I did a good job with it, kind of running from there. A really difficult opponent for me, someone who's gotten me in three sets after I've won the first set twice."

He will face ninth-seeded Alex de Minaur of Australia, a 6-2, 4-6, 6-4 winner over seventh-se...