American Ben Shelton triumphed in his all-American clash with compatriot Brandon Nakashima 7-6 (8/6), 6-1 to advance to his third ATP Masters 1000 quarterfinal at Indian Wells on Wednesday.
Shelton, 22, becomes the youngest American man in the last eight at Indian Wells since Andy Roddick in 2004.
Shelton was two points away from losing the first set when he was 6-6 in the tie-break, but Nakashima missed a backhand volley and then found the net.
From then on it was all Shelton as he sealed the win in one hour and 34 minutes.
"For me the second set was outstanding. Whenever you can get a two-break win in a set against a server like him is really encouraging for where my level is at," Shelton said.
"I am pleased with my performance today. I think there are things I am trying to add into my game each week and I am trying to implement them this week.