That's a lot of Jasons:

MMAWeekly.com is reporting that Canadian middleweight Jason “Dooms” Day has withdrawn from his scheduled September 6th bout with Jason “The Punisher” Lambert. According to the report, Day suffered an elbow and biceps injury that will require him to undergo a MRI and keep him out of the fight.

Sherdog.com is now reporting that Day’s replacement will be fellow Canadian Jason “The Athlete” MacDonald.

MacDonald, a native of Pictou County, Nova Scotia, possesses a UFC record of 4-3 with victories over Ed Herman, Chris Leben, Rory Singer, and Joe Doerksen. MacDonald’s most recent outing came at UFC 87: Seek and Destroy where he fell victim to the ground game of Demian Maia after three grueling rounds.

Jason Lambert is looking to test his hand at 185 pounds after spending the majority of his career in the light heavyweight division. Lambert has gone 4-3 in the UFC with victories over Renato “Babalu” Sobral, Branden Lee Hinkle, Terry Martin, and Rob MacDonald.

As for the match-up, MacDonald must have a bitter taste in his mouth after his loss to Maia at UFC 87. And while MacDonald's willingness to let his opponents often dictate the real estate of their fights is troubling against a strong wrestler like Lambert (and Okami), MacDonald's guard should prove difficult for him. And Lambert's decision to cut to 185lbs will also compound his difficulties. It's arguable, but MacDonald might be a more dangerous opponent.