EXCLUSIVECharles Barkley got LAST PLACE at a celeb golf tourney in Lake Tahoe ... finishing behind Larry the Cable Guy ... and along the way he cussed out his golf ball ... and TMZ Sports has the footage.
Sir Chuck was playing in the American Century Championship ... where he may have turned in the worst performance of his life.
He finished 86th out of 86 celeb players ... behind 85th place (Team USA female hockey star Hilary Knight) ... and 84th place (Larry the Cable Guy).
In fact, Barkley didn't make par ONCE during the tourney and only bogeyed 5 times in 54 holes.
On the other side of the spectrum, Mark Rypien CRUSHED IT ... winning the tourney in front of Jeremy Roenick and Annika Sorenstam.
Other notable finshers who beat Barkley -- Alan Thicke (83rd place), Ray Romano (80th) and Bill Engvall (75th).