US Open star Taylor Fritz suffers embarrassing wardrobe malfunction in primetime TV showdown with Novak Djokovic

Taylor Fritz's headband sponsor may have been left a little disappointed on Tuesday night after the American tennis star accidentally put it on upside down for his big US Open quarterfinal against Novak Djokovic.

The No 4 seed headlined Arthur Ashe in one of the biggest nights of his career so far, simultaneously giving BOSS some important air-time for their brand.

But when putting on his outfit in the locker room before the match in New York, Fritz inadvertently placed his headband on upside down, making it difficult to read when shown on screen.

The wardrobe blunder is made more notable by the pristine style of his girlfriend Morgan Riddle, whose outfits are always styled perfectly... and perhaps he'll wish she was present before the match to correct his error.

Some on social media claimed it was a deliberate decision from the 27-year-old, meanwhile, with popular blog 'The Tennis Letter' claiming: 'I guess you have to switch things up when you're 0-10 against someone.'

Another joked 'Mans ssobing already', referencing the SSOB ordering of the letters on his backwards BOSS headband.

And it was a difficult first set for the American, who quickly fell behind despite his superior seeding to the legendary Novak Djokovic, seventh favorite heading into the tournament despite his record 24 major titles.

Fritz has enjoyed a quietly impressive run to the quarterfinals at Flushing Meadows, staying under the radar and only needing to beat one seeded player en route to the last eight.

That victory came in the previous round against Tomas Machac, and Tuesday's showdown with Djokovic marked the first time Fritz was slated for a match on the main Arthur Ashe court at the US Open.