"Justin Bieber seems like a wimp" -- UFC star Ben Askren.
Yep, the biggest stars in the UFC are well aware of the possible Tom Cruise vs. Justin Bieber superfight ... and top-ranked welterweight Ben Askren is already picking a winner.
"I'm gonna say Tom Cruise," Askren says ... "Like, Tom Cruise at least seems like he's probably been through some sh*t."
As we previously reported, Bieber's rep, Scooter Braun, recently told Dana White he'd be down to fight FOR REAL if Tom signs on .