Milos Raonic Injury: Updates on Tennis Star's Quad and Return

The World Tour Finals is now down one of its top players as No. 8-ranked Milos Raonic has been forced to withdraw due to injury.

According to Kevin Mitchell of The Guardian, the Canadian star is pulling out of the tournament in London due to a quad ailment:

Per BBC Tennis, Raonic said that he suffered the injury during Tuesday's loss to Andy Murray:

Now that Raonic is out of the running, he will be replaced by Spain's David Ferrer, according to ESPN Tennis:

"

David Ferrer will step in to replace Raonic at ATPFinals and face Kei Nishikori at 9 am ET on @ESPN3.

— ESPNTennis (@ESPNTennis) November 13, 2014"

While Raonic was still technically in the running prior to his withdrawal, he had an uphill climb when it came to the prospects of advancing through the round-robin stage. Having already lost to Roger Federer and Murray, he needed to beat Kei Nishikori and get some help as well.

With Raonic no longer a factor, here is a look at the scenarios for advancement out of Group B, courtesy of Bleacher Report UK:

Raonic simply couldn't continue, though, and he has to remain focused on what the future holds. The 2015 Australian Open starts in January, and Raonic said that playing through the injury could have kept him out for as long as two months:

That would have put his Aussie Open status very much in doubt, so it is easy to see why Raonic made the difficult decision to pack it in.

Follow @MikeChiari on Twitter