One of the most intriguing 1st rounds of this US Open was definitely the clash against Denis Shapovalov and Felix Auger-Aliassime that are widely considered the future of Tennis Canada.
After the 2 best friends shared the first 2 sets the crowd got shocked as Felix was struggling with his health. Felix had a prolonged medical time-out at the beginning of the 3rd set as he was feeling faint. Unfortunately, he had to retire (and for good) when he was 7-5 5-7 4-1 down.
Eventually, Felix ended up in tear with Dennis giving him a big friendly hug.  Felix apologized to the crowd saying, “I am sorry.”
What’s the problem of Felix Auger-Aliassime?
Unfortunately, this is not a new condition for Felix as he had to withdraw from the Challenger in Guadeloupe last year when he was diagnosed with tachycardia.
This kind of conditions could be very harmful in tennis and players such as Mardy Fish had to retire. Let’s hope this is not the case.
Fellow Canadians @FelixTennis and @Denis_Shapo share an emotional embrace after Felix is forced to retire from #USOpen Rd. 1.pic.twitter.com/undBIeI1iX
— Tennis Channel (@TennisChannel) August 28, 2018
Follow up on 🇨🇦 Felix Auger-Aliassime…Monday’s heart rate issue at US Open is something he has dealt with before.. Withdrew from Challenger in Guadeloupe last year… He was diagnosed with “tachycardia” when heart rate exceeds the normal resting rate… #USOpen
— John Horn (@SportsHorn) August 28, 2018
Heartbreaking scenes at the end of the Shapovalov v Auger-Aliassime match as Felix is forced to retire in 3rd set … the 18-year-old was dealing with racing heart rate & also feeling faint … Denis, 19, embraced & consoled his good friend who was in tears …
🇨🇦💔
— Mark Masters (@markhmasters) August 28, 2018
After looking into it, it appears Felix Auger-Aliassime suffers from a heart condition known as Tachycardia — makes your heart beat more than 100 times per minute.
It’s been a concern in some of his past matches.
— Devin Heroux (@Devin_Heroux) August 28, 2018