Ryan Harrison Stuns No. 5 Seed in U.S. Tennis Open

By ESPN

Ryan Harrison, a 24-year-old American who has struggled to approach the expectations placed on him, played the match of his life on Wednesday at the US Open.

Harrison stunned No. 5-seeded Milos Raonic 6-7 (4), 7-5, 7-5, 6-1 in the biggest upset of the tournament so far. A raucous capacity crowd of 8,200 at the tournament's new Grandstand stadium was thrilled with the result.

"It's so cool," Harrison said. "The first two sets, when you have a crowd behind you like that, you're just playing on adrenaline. It was incredible."

For the first time, the ATP World Tour's No. 120-ranked player finds himself in the third round of a Grand Slam event. And he had to qualify his way into the event.

According to ESPN Stats & Information research, Harrison is the first American qualifier in the Open era to defeat a top-five seed at the US Open.

It was only the second time in 28 attempts that Harrison has beaten a top-10 player.

Johanna Konta suffered a health scare when she collapsed on court in 80 percent humidity at the US Open, but returned to record an improbable second-round victory.

Having taken the first set against Tsvetana Pironkova, the British No. 1 appeared to be struggling in the conditions at Flushing Meadows and was red in the face, with temperatures also reaching 31 degrees Celsius on Wednesday.

She began to hyperventilate while serving to force a tiebreaker in the second set on Court 13 and then fell to her knees on the baseline.

Konta gasped for breath as she sat down on a towel with bags of ice under her arms before the trainer arrived. She then lay on her back as the trainer and doctor took her blood pressure before helping her back to her chair, where she had her legs rubbed with ace.

"I was feeling a little bit the conditions, and my own energy levels," Konta told a press conference. "My heart rate spiked and I couldn't really control my breathing. I started hyperventilating. I started shaking. That's why I went down on the ground, because I was quite violently shaking.

"We are very fortunate with the medical staff that we have here. Once they came out I did panic a little bit. They kind of calmed me down. They did all the necessary checks to see how I was doing immediately then. Since then I've done all the necessary checks, as well. So, yeah, all should be good."