Former UFC star Chuck Liddell has has had a pop at Serena Williams' sparring session with Mike Tyson. 

Earlier this month Williams, the 23-Grand-Slam-titles winner underwent a training session with the retired boxer.

Liddell, who has had previous run-ins with Tyson said: "She looks like a girl who just learned how to punch."

He continued: "Mike's a BAAAD man! Trust me!  If she wants to fight and Mike teaches her? She'll be a BAAD woman!"

The training session video received over 1.5 million views on social media.