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

Both Walker and his accuser Unique Allen 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.

As for Walker, he says he did nothing wrong — but says he regrets not staying at the motel for police to arrive.

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