Jack Sock happy with US Open progress

Jack Sock has admitted that he has been pleased with the way that he played during his US Open campaign.

The American youngster reached the final 32 at Flushing Meadows before losing in four sets to world number 12 Nicolas Almagro earlier today.

Having entered the competition ranked 243 in the world, the 19-year-old has revealed that he benefited greatly from competing against some of the senior players.

"I feel good about my game, my physicality and overall professionalism and mental [state]," he told reporters. "Everything in my game, how I'm hitting the ball, everything feels better now and definitely closer to the next level."

This year's event in New York is the first time that Sock has appeared in a Grand Slam.