Opelka, Nakashima through to quarterfinals at Delray Beach Open

The American put on an almost flawless serving display, winning 89% of his first serve points in his 6-3 6-4 victory over Mackenzie McDonald. Furthermore, the towering American hit 17 aces, bringing his tournament total to 37.

Awaiting Opelka in the next round is South Korea's Soonwoo Kwon, who squandered two match points but was able to defeat wildcard Ryan Harrison 6-4 3-6 7-6(0). The recent New York quarterfinalist has been impressive over the last few weeks, also reaching the same stage at the Tata Open.

American wildcard Brandon Nakashima is probably having the best week of his young life. The 18-year old defeated British qualifier Cameron Norrie 7-5 6-2 to reach his first ATP quarterfinals, in his debut ATP Tour-level event.

”I always knew that I had the game to compete with these high-level pros. I just had to have the right opportunities,” Nakashima said after the match. “I was just hoping to play a good first-round match here, but after winning these two matches, I have a lot of confidence in my game now… Hopefully I can keep it going.”

Nakashima will face Japan's Yoshihito Nishioka, who breezed past American qualifier Noah Rubin 6-1 6-2 in 55 minutes. Nishioka won 88% of points on his first serve, and never even faced a break point.

[embed]https://twitter.com/TennisTV/status/1230249730652934144[/embed]