Rublev stuns Dimitrov, Del Potro through

Nineteen-year-old Andrey Rublev registered a shock 7-5, 7-6 (7/3), 6-3 over seventh seed Grigor Dimitrov, while Alexandr Dolgopolov beat 15th-seeded Tomas Berdych 3-6, 6-1, 7-6(5), 6-2. However, Juan Martin del Potro eased past Adrian Menendez with a 6-2, 6-3, 7-6(3) win.

Andrey Rublev caused a major upset as he defeated Bulgarian seventh seed Grigor Dimitrov 7-5, 7-6 (7/3), 6-3 in the second round.   -  Getty Images

Russia's Andrey Rublev became the second teenager to make the US Open third round on Thursday when he stunned Bulgarian seventh seed Grigor Dimitrov 7-5, 7-6 (7/3), 6-3.

Rublev, just 19 and the world number 53, joins 18-year-old Denis Shapovalov of Canada in the last 32 at a Grand Slam event for the first time.

The teenage number could be boosted later Thursday when 19-year-old Taylor Fritz of the United States tackles Austrian sixth seed Dominic Thiem.

"It's an amazing feeling. I'm very happy to win this match," said Rublev after stunning Cincinnati Masters champion Dimitrov to set-up a clash with Bosnia's Damir Dzumhur for a place in the last 16.

"I was thinking before the match -- I have to play my rhythm, my speed, because I know with my speed I can compete with any of the top players and I did it."

LOPEZ BATTLES PAST VERDASCO
In an all Spanish affair, Feliciano Lopez beat Fernando Verdasco 6-3, 6-2, 3-6, 6-1 in a tightly contested second-round affair.

AGUT THWARTS BROWN

Eleventh seed Roberto Bautista Agut swept past Germany's Dustin Brown in a straight-sets 6-1, 6-3, 7-6 (7/3) victory to advance to the third round.

DEL POTRO CRUISES THROUGH

Twenty-fourth seed Juan Martin del Potro eased past Adrian Menendez with a 6-2 6-3 7-6(3) win to reach the third round.

Del Potro claimed his only grand slam title at Flushing Meadows in 2009.

DOLGOPOLOV PULLS OFF BERDYCH UPSET

Unseeded Ukrainian Alexandr Dolgopolov beat 15th-seeded Tomas Berdych 3-6 6-1 7-6(5) 6-2 to seal a third round spot. The 28-year-old will face Serbian Viktor Troicki in the next round.

13 of the top men's seeds have exited the competition in the first two rounds so far along with second seed Andy Murray, who pulled out before the start of the tournament due to a hip injury.