Johnny Moore's three-point basket with 12 seconds remaining in overtime climaxed a career-high 39-point performance that led the San Antonio Spurs to a 127-126 playoff victory over the Denver Nuggets tonight.

The victory gave the Spurs a 3-0 lead in the best-of-seven Western Conference semifinal series. Game 4 is scheduled in Denver Monday night.

Moore scored all nine of the Spurs' points in overtime as San Antonio on three occasions recovered from a two-point deficit. Denver forward Kiki Vandeweghe, who scored 34 points, made two foul shots with 25 seconds left in overtime to give Denver the lead, 126-124.

Moore's clinching basket from just outside the three-point circle came after a San Antonio timeout. Denver then played for one final shot, but Dan Issel's long jumper hit off the rim as time ran out.

Neither team led by more than five points until the final quarter.

Alex English and Issel, both of whom were doubtful for the game because of injuries, helped Denver to its biggest lead, 110-104. San Antonio promptly countered, scoring 10 straight points, six by Moore, to move to a 114-110 edge.

Moore's two foul shots put the Spurs up by six, but baskets by Issel, English and Vandeweghe made it 118-118 at the end of regulation.

English led Denver with 39 points.