John Wathan ruined Randy Wiles' major league debut with a pinch-hit single to score Amos Otis with the winning run and give the Kansas City Royals a 3-2 victory and a three-game sweep of the Chicago White Sox today.

Otis led off the ninth with a walk, was sacrificed to second and scored on Wathan's hit.

The victory, Kansas City's 13th straight at home, trimmed Chicago's lead in the American League West to a half-game over Minnesota. The Royals are 1 1/2 back. It was the Sox' seventh loss in their last eight games.

The White Sox tied the game, 2-2, on Oscar Gamble's 20th homer, leading off the ninth inning. Kansas City took a 2-1 lead when Al Cowens led off the seventh with a double off the center-field wall, only the third hit of the game off loser Ken Kravec, Cowens took third on a groundout and scored on Joe Zdeb's single through a drawn-in infield.

Kansas City scored its first run in the fourth when Tim Nordbrook misplayed Cowens' pop fly into a double. Cowens scored on John Mayberry's single. Chicago got its first run on a one-out single by Ralph Garr in the sixth followed by Jorge Orta's double.

The largest crowd of the season in Kansas City, 40,247, watched the Royals complete the sweep.

Wathan was less than sympathetic toward Wiles.

"That's a shame," he said amid a chorus of laughter.

"Just tell him that in my debut I grounded into a bases-loaded double play."

The Royals established two attendance records over the weekend. The series total of 118,425 set a new high for three games and today's crowd marked the first time the Royals had gone more than 40,000 for consecutive contests. It was also the second largest crowd in Royals regular season history.