Luke Walton has lawyered up in his sexual battery case -- and now the NBA coach and his attorney are blasting his accuser as a lying "opportunist."
TMZ Sports broke the story ... sports reporter Kelli Tennant is suing the Sacramento Kings head coach claiming he sexually assaulted her back when he was an assistant with the Golden State Warriors.
Now, Walton has hired attorney Mark Baute, who issued a fiery statement slamming Tennant's allegations.
"Luke Walton retained me to defend him against these baseless allegations," Baute said.