San Antonio forward Tim Duncan (21) takes a shot against Lakers forward Lamar Odom in the first half. The Spurs defeated the Lakers, 103-84, to cut Los Angeles' series lead to 2-1 on Sunday in San Antonio.

San Antonio ? The San Antonio Spurs opened another big lead over the Los Angeles Lakers on Sunday night. This time, they kept it.

Manu Ginobili broke out of his scoring slump with 30 points off the bench and the Spurs beat the Lakers, 103-84, in Game 3 of the Western Conference finals.

Tim Duncan had 22 points, 21 rebounds and five assists, and Tony Parker added 20 points and five assists for the Spurs, who remained unbeaten at home this postseason and avoided falling into an 0-3 hole, which no NBA team has ever overcome.

The Lakers lead the series, 2-1. Game 4 is Tuesday in San Antonio.

The Spurs squandered a 20-point lead to lose Game 1 in Los Angeles and the Lakers routed them in Game 2.

Kobe Bryant led the Lakers with 30 points and Paul Gasol scored 15. Lamar Odom struggled all night, finishing 2-of-11 from the field for seven points. But he had six of the Lakers’ 13 assists and 11 rebounds.

“They played solid defense, but we missed a lot of easy ones,” Bryant said.

The Lakers only went 8-of-17 from the free throw line.

On Sunday, the Spurs got a lead midway through the second quarter and never looked back, despite a late surge from Bryant.

In the first half, Parker was penetrating the paint, but Ginobili was the big key for the Spurs. He had 22 points at the break – more than the 17 he scored in Games 1 and 2 combined. And whether or not his injured left ankle was bothering him, he didn’t need it to explode to the basket because he hit 5-of-7 from three-point range.

“He is such a competitor,” Spurs coach Gregg Popovich said. “He puts so much on his shoulders, he fights through a lot of things.”

Ginobili got a standing ovation from the crowd when he went to the bench with 2:56 to play.