NBA's Samaki Walker: I Didn't Beat Up My GF ... Despite Allegations

Former L.A. Lakers player Samaki Walker is adamant he did NOT attack his girlfriend in a motel parking lot last week ... though his accuser says Walker was violent and is lying through his teeth.

Here's what we know ... both Walker and his accuser Unique Allen (who gave us permission to use her name) had an altercation at a motel in Encino, CA early Thursday morning.

Allen tells TMZ Sports ... the argument (which started in their room) moved to the parking lot -- but when the two got inside Samaki's Range Rover, he struck her several times in the jaw and arm.

Allen says Walker also choked her. Allen sent us a photo showing what she claims is bruising on her arm.

Cops were called to the scene regarding a fight between a man and a woman in an SUV -- but the two were gone by the time cops arrived.

40-year-old Walker tells us he absolutely did NOT strike Allen during the dispute -- and says she was the aggressor ... hitting him multiple times though he swears he did not strike back.

Allen has NOT filed a police report, but says she is still considering her legal options.