Japanese tennis star Kei Nishikori who back in 2008 lifted the XL Bermuda Open Tennis Tournament Trophy is a doubt for the US Open after confirming he has tested positive for coronavirus for a second time.
Nishikori initially tested positive last Sunday August 16th, which came just 24 hours before he was due to leave his base in Florida for New York.
He was forced to withdraw from the Cincinnati Masters - also known as the Western and Southern Open - as a result.
The tournament is serving as the US Open warm-up event and has been moved from Cincinnati to New York City due to the pandemic.
Nishikori said he remain in isolation in Florida and will take another test early next week.
"Just a little update, I just took another Covid test and am still positive," Nishikori wrote on his official app.
"I have very minimal symptoms and am staying in full isolation in Florida.
"The next test will be early next week at which time we will update you with more information."
The 2014 US Open runner-up and Olympic bronze medalist will not be able to participate at the Grand Slam event unless he recovers from coronavirus.
Players competing at the US Open have to enter a "bio-secure bubble", including mandatory tests before being allowed into the Flushing Meadows site.
The US Open has been hit by a series of high-profile withdrawals, including defending champions Rafael Nadal and Bianca Andreescu.