George Gervin scored 22 of his 32 points in the second half tonight and the San Antonio Spurs defeated the Los Angeles Lakers, 122-113, to tie their National Basketball Association Western Conference championship series at 1-1.

The best-of-seven series now moves to San Antonio for the third and fourth games, Friday night and Sunday afternoon.

Gervin was sensational in the second half despite picking up his fourth foul 3:27 into the third period. He scored 16 points that quarter, making all seven of his shots and two free throws. For the game, the four-time league scoring champion made 13 of 20 shots.

San Antonio center Artis Gilmore, held to seven points and six rebounds in the series opener, won by the Lakers, 119-107, had 27 points and 20 rebounds in the second game.

Mike Mitchell also had 27 points and pulled down 15 rebounds for the Spurs. Johnny Moore had 16 points and led both teams with 15 assists.

Earvin (Magic) Johnson and Norm Nixon led the Lakers with 28 points each. Johnson also had a team-leading 12 rebounds. Kareem Abdul-Jabbar, who had 30 points in Game 1, was held to 19 tonight, scoring all but six in the first half.

The Spurs never trailed in the game. They scored 10 straight points to turn a 2-2 tie into a 12-2 advantage and were on top, 31-17, after eight minutes of play.

It was 35-26 at the end of the first quarter and 49-35 before the Lakers scored 22 of the last 33 points of the half to trail, 60-57, at the intermission.

Los Angeles got as close as 66-65 early in the third quarter before the Spurs, led by Gervin, opened up a 13-point advantage late in the period.

The Lakers closed to 97-89 entering the final quarter and twice got as close as one point. San Antonio led, 103-102, midway through the period before outscoring Los Angeles, 12-4, to take a nine-point lead. The Lakers couldn't get closer than six points after that.

The loss was the first for the Lakers at the Forum in their last 12 playoff games dating back to last season. The Spurs were the only team to win two games on the Lakers' home court during the regular season.