Dallas Mavericks point guard Devin Harris tells TMZ Sports ... he knows EXACTLY how to save Justin Bieber's life ... by kicking his ass into shape at the gym with some serious basketball workouts.
"Come on Bieber, you know better," Harris says ... adding "come get in some workouts with me and we'll get you focused and back on track."
Harris made the statement in the wake of Bieber's DUI arrest yesterday ... after he was pulled over by cops for drunkenly street racing around Miami.
We all know Justin loves basketball almost as much as his Segways and diaper pants -- so maybe some one-on-one with Harris could actually do the trick.
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