Former #1 overall pick Markelle Fultz is desperately trying to salvage his NBA career ... and he turned to Kobe Bryant for help, spending the summer at Mamba's training facility.
Fultz -- who was drafted before NBA stars like Jayson Tatum, De'Aaron Fox and Donovan Mitchell -- has seen his career get off to a super shaky start.
Over 2 seasons, Fultz -- who's now on the Orlando Magic -- has only played in 33 games (he started 15) .