It was a day of upsets at the Delray Beach Open as top seed Jack Sock, sixth seed John Isner and ninth-ranked Milos Raonic all crashed out.
Defending champion Sock, who won his first match of the year when he beat qualifier John-Patrick Smith in his opener in Florida, went down 4-6, 7-5, 6-3 against fellow American Reilly Opelka.
The 20-year-old Opelka served 17 aces to claim the biggest win of his career, yet he didn’t think he served that well.
“I didn’t serve as well as I’d have liked to or as well as I usually do,” he said.
“I was really pleased with how I played from the baseline though. I thought I hit my forehand great and made it really tough for him to be offensive, which is his game.”
Isner fired 30 aces, but he was still bundled out as he lost 7-6 (7-3) 6-7 (4-4) 7-6 (7-5) against Peter Gojowcyzk.
Former Wimbledon runner-up Raonic is also on the way home as he suffered his first defeat in four matches against Steve Johnson, losing 6-2, 6-4 to the American.
“I’ve got to definitely review it, think about it, because that was a pretty poor level I put out there today,” the Canadian said.
“Not much to be happy with. I had a tough time with a lot of things today.”
Donald Young is also out as he went down 7-6 (8-6), 6-3 against Evgeny Donskoy.
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