Jannik Sinner reaches the Wimbledon quarterfinals despite a bad elbow when an injured Dimitrov stops

LONDON — Jannik Sinner advanced to the Wimbledon quarterfinals despite hurting his right elbow in a fall in the opening game and dropping the first two sets Monday night, when his opponent, Grigor Dimitrov, wound up quitting in the third because of an injured pectoral muscle. Sinner said he will have an MRI exam Tuesday on his elbow "to see if there's something serious" and added in Italian: "There is some concern." The No. 1-seeded Sinner hadn't dropped a set in the tournament until falling behind No. 19 Dimitrov 6-3, 7-5. But at 2-all in the third set, Dimitrov stopped playing. It's the fifth consecutive Grand Slam tournament where the 34-year-old Dimitrov failed to complete a match. He also did it at the Australian Open in January and the French Open in May, plus last year's Wimbledon and U.S. Open. "He's been so unlucky in the past couple of years. An incredible player. A good friend of mine, also. We understand each other very well, off the court, too," Sinner said. "I hope he has a speedy recovery." On the last point against Sinner, Dimitrov served and immediately clutched his chest with his left hand. He took a few steps and crouched, before sitting on the grass. Sinner walked over to that side of the court to check on him. "My pec," Dimitrov told Sinner. Dimitrov — a three-time major semifinalist, including at Wimbledon in 2014 — then went to the sideline, sat in his chair and was checked by a trainer and doctor. As Dimitrov talked with them, Sinner knelt nearby. After a delay of a few minutes, Dimitrov walked toward the locker room with the medical personnel. Soon, he reemerged and said he couldn't continue. "I don't take this as a win, at all," Sinner said. "This is just a very unfortunate moment to witness for all of us." Two hours earlier, it was Sinner down on the ground and seemingly in trouble. He was hurt on the match's seventh point, when his foot gave out from under him as he ran to his left and he slipped and fell behind a baseline, bracing his fall with his right hand while still holding his racket. During a medical timeout while trailing 3-2 in the second set, Sinner winced as a trainer massaged the elbow. Sinner's coaches, Darren Cahill and Simone Vagnozzi, looked on from their box with concern. Sinner was given a pill to take and play resumed. He frequently shook his right arm or rubbed his elbow between points. The 23-year-old Italian is a three-time Grand Slam champion who will play No. 10 Ben Shelton of the United States for a berth in the semifinals. Sinner leads the head-to-head series 5-1 and has won their past five matches, all in straight sets, including at Wimbledon last year and the Australian Open this year. Sinner entered Monday having lost a total of just 17 games in the tournament, tying the record for the fewest in the Open era by man at Wimbledon through three completed matches. Right after he fell behind by two sets against Dimitrov, the match was paused so the stadium's retractable roof could be closed because of fading sunlight. Two-time Wimbledon champion Andy Murray was not a fan of that decision, writing on social media: "So ridiculous to close the roof at this stage of the match. At least an hour of light left….well over a set of tennis can still be played..its an outdoor tournament!" About a half-hour later, the match was over.