LAWYERS for Robert Kennedy's assassin claim to have evidence that hands them ''game, set and match'' in their campaign to free him, 42 years after he was jailed for shooting the senator at a California hotel.

They have launched a fresh appeal on behalf of Sirhan Sirhan, 67, claiming in court for the first time that prosecutors fabricated ballistics evidence at trial, switching a bullet that was taken from the dead senator's neck for one they said matched the defendant's gun.

Robert Kennedy immediately after the shooting.

Lawyers have also sought a re-examination of claims that Sirhan was framed by agents - indirectly suggested as being the CIA - who ''hypno-programmed'' him into taking part to divert attention from their own fatal gunfire.

Court documents filed in Federal Court in Los Angeles pull together years of research, documents and psychological analyses of Sirhan for a case that his lawyer says proves him to be a victim of ''an egregious miscarriage of justice'' and ''horrendous violations'' of his legal rights. ''On the law, and on the evidence, it's game set and match to us. It's all over,'' Dr William Pepper said.