Tyrone Spong out, Clinton Williams in against Jake Heun at WSOF 26

Tyrone Spong is having a hard time making his big MMA return.
The world-class champion kickboxer is injured and out of his co-main event fight with Jake Heun at World Series of Fighting 26 on Dec. 18 in Las Vegas, WSOF president Ray Sefo confirmed with MMA Fighting's Ariel Helwani. The MMA Kings was the first to report the news on Twitter.
In Spong's place will be Clinton Williams, according to Sefo. Williams (7-2), a well-muscled heavyweight, will be making his WSOF debut. The 31-year-old