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According to MMAJunkie, Don Frye has been replaced as headliner for M-1 Breakthrough:

"M-1 Breakthrough" will now feature a main event between previously scheduled headliner "King" Mo Lawal and replacement fighter Mark Kerr.

King Mo (4-0) was originally scheduled to face Don Frye at the main event of M-1 "Breakthrough" but an injury forced him to pull out. Frye will be replaced by 40-year-old, PRIDE and UFC veteran, Mark Kerr (15-10).

Kerr will be the more experienced fighter, but he has lost his last four fights, including nine of the past eleven fights dating back to the year 2000.

Hoping to add more star power to the event, officials added an exhibition match between Fedor Emelianenko and Gegard Mousasi:

Additionally, the Aug. 28 event, which takes place in Kansas City, will feature a special exhibition match between recent Strikeforce signee Fedor Emelianenko and Gegard Mousasi.

The friendly exhibition match won't be under normal MMA rules and will not have any judges. The match will happen less than two weeks after Gegard Mousasi faces Babalu Sobral in Strikeforce: Carano vs. Cyborg.