Ice Cube clearly thinks Caitlin Clark can succeed in the Big3 ... but one man who's convinced she can't is ex-NBA star Kenyon Martin, who said Wednesday she wouldn't be able to score a single point in the 3-on-3 league.
The Iowa Hawkeyes star received a $5 million offer to join Cube's hoops org. on Wednesday ... but when Martin was asked how he thinks she'd fare if she accepted the deal -- he made it clear, he thinks it'd be a mess.
"It's a step under prison ball," the former NBA player said of the Big3's action on Gilbert Arenas' "Gil's Arena Show.