"I'm uneasy about him for the first time" - Pam Shriver unsure of Federer's chances at Wimbledon

Retired American tennis player Pam Shriver believes that Roger Federer should not compete at Wimbledon if he's significantly below his best, implying this was the case in the Swiss's loss at Halle.

“I’m uneasy about him for the first time. I don’t think he should compete if he’s significantly below ‘Roger Federer level,’ and I thought the final two sets in Halle were significantly below that level,” the American said in an interview for Tennis.com.

Federer fell to Canadian Felix Auger-Aliassime 4-6 6-3 6-2 in the second round, with the 39-year old looking out of sorts towards the end of the match.

A winner of 21 Grand Slam doubles titles, Shriver added that Federer's chances at the US Open were also slim, considering he could end up playing five sets on the hard courts of Flushing Meadows.

“Look what happened at the French Open, on softer clay," stated Shriver. "Will Roger’s knees be that much better and ready for best-of-five set hard-court matches just two months later?”

Following Rafael Nadal's withdrawal from Wimbledon, Federer will be seeded seventh at the event, where he has triumphed on eight different occasions.