Kirk Rueter allowed two hits over 8 1/3 innings in his major-league debut, and Larry Walker and Moises Alou homered as Montreal cooled off San Francisco.
Rueter (1-0) allowed a leadoff walk and a single, then retired the next 18 batters. The 22-year-old left-hander faced just three batters in every inning but the first, eighth and ninth in stopping the Giants’ three-game winning streak and the Expos’ three-game losing streak.
In their previous three games, the Giants had scored 33 runs on 44 hits. They had beaten the Expos six straight times.
Rueter left after walking Steve Scarsone with one out in the ninth. John Wetteland got the final two outs for his 19th save.
Rueter walked Will Clark to start the seventh, but the Expos turned an inning-ending double play. Rueter struck out five and walked three in beating San Francisco rookie Greg Brummett (1-2).
Walker led off the second with his 11th homer, the only hit Brummett allowed until Darrin Fletcher’s two-out single in the fifth.
Brummett, recalled from Triple-A Phoenix on Monday to replace the injured Trevor Wilson, was making his third start for the Giants.
The Expos got their second run in the sixth on Marquis Grissom’s sacrifice fly that scored Sean Berry. Delino DeShields singled in the inning to extend his hitting streak to 10 games.
Alou, who had two home runs on Tuesday, hit his 10th against Jeff Brantley in the seventh.
Rueter began the year with Double-A Harrisburg, where he went 5-0 with a 1.36 ERA to lead the Eastern League. He was promoted to Triple-A Ottawa in early June, going 4-2 with a 2.70 ERA, before being called up on Monday.
He was was the Expos’ 18th-round pick in 1991 and spent all last season with Class A Rockford of the Midwest League, compiling an 11-9 record.
Brummett allowed two runs on four hits, struck out two and walked one before leaving in the sixth.
