Mike Warren, less than a year out of Class A, became the first rookie in 10 years--but the second pitcher in four days--to throw a no-hitter tonight as the Oakland A's beat the American League West champion Chicago White Sox, 3-0.

Warren's no-hitter was the third in the major leagues this season and the second this week. Bob Forsch of the St. Louis Cardinals held the Montreal Expos without a hit Monday night and Dave Righetti of the New York Yankees pitched one July 4 against the Boston Red Sox.

Warren, 22, struck out four and walked three in winning his fifth game in eight decisions. The last no-hitter produced by Oakland's staff was on Sept. 28, 1975, when Vida Blue, Glenn Abbott, Paul Lindblad and Rollie Fingers pitched a 5-0 victory over the California Angels.

There were no outstanding plays behind Warren. The closest the White Sox came to a hit was in the eighth when pinch hitter Mike Squires hit a long ball that right fielder Mike Davis, who had just entered the game as a defensive replacement, caught at the wall near the 372-foot mark for the final out of the inning.

Warren did not allow a batter to reach second base and faced just two batter over the minimum of 27. In the third, he walked Scott Fletcher, who was thrown out stealing. Tom Paciorek walked in the fifth.

Warren, who made his major-league debut June 12 against Chicago and made a wild pitch to Greg Luzinski on his first pitch in the big leagues, ran halfway to the mound to start the ninth. A crowd of 9,058 cheered on the cold and windy night as he took his warmups.