Joaquin Andujar became the first 13-game winner in the major leagues with a six-hit shutout last night as the Cardinals beat the New York Mets, 6-0, in St. Louis.

Andujar, who had lost his last two bids for his 13th, struck out three and walked one in raising his record to 13-3. It was his seventh complete game.

The victory put the Cardinals (42-29), who have won 11 of the last 14 games, into first place in the National Legaue East, a half-game ahead of the Montreal Expos (43-31), who lost to Philadelphia yesterday.

Mets rookie Rick Aguilera (1-2) gave up four runs in the second inning. With one out, Curt Ford singled and stole second. Ivan DeJesus reached on an error by third baseman Howard Johnson and Tom Nieto hit a triple down the right field line for two runs.

Andujar struck out, and after a 39-minute rain delay, Vince Coleman hit a run-scoring single. Coleman stole second, his major league-leading 51st stolen base, and went to third on catcher Gary Carter's throwing error. Ozzie Smith's single scored Coleman.

St. Louis added a run in the seventh off reliever Terry Leach on Tommy Herr's RBI double and another in the eighth off Doug Sisk on Andujar's RBI single. Herr leads the major league with 61 RBI.