Justin Timberlake -- He'd Kill Bieber In Basketball ... Says NBA Player (VIDEO)

They're not gonna like this up in Canada ...

Pelicans player Quincy Pondexter thinks age beats beauty in a hardwood battle between Justin Bieber and Justin Timberlake ... saying Timberlake would easily dismiss the Biebs on the court.

Quincy started his career with the Memphis Grizzlies -- where Timberlake is part owner ... so when we got him out in Beverly Hills we had to ask if Timberlake can actually hoop.

Pondexter says he's played with JT, who definitely has game -- "for a white guy" -- and when we asked who'd win a matchup between JT and Justin Beiber, Quincy couldn't have been stronger.

"I'll take Timberlake all day."

1-on-1 for charity? We'd watch.