Zane Smith allowed only two hits as the Braves beat the Los Angeles Dodgers, 3-0, yesterday in Atlanta.

The only hits off the left-hander were singles by Bill Russell in the fifth inning and Enos Cabell in the ninth. It was the Dodgers' fifth consecutive loss and left them with a 3-9 record, equaling their worst start since 1976.

Smith (1-0) got all the runs he needed in the first on Terry Harper's two-run bases-loaded single off Orel Hershiser (1-2).

*Cardinals 9, Expos 6: Pitcher Tim Conroy, batting for his first time in the major leagues, drew a bases-loaded walk with two outs in the 17th inning and Willie McGee followed with a two-run single for St. Louis in Montreal.

The longest game in the majors this season took 5 hours 22 minutes. St. Louis, which had tied it in the ninth, scored in the 13th and 14th innings only to have Montreal tie. Conroy (1-0), the sixth St. Louis pitcher, threw three hitless innings.

Meanwhile, Cardinals right-hander Danny Cox, on the disabled list with a chip fracture of the right ankle suffered March 30, pitched in a simulated game in St. Petersburg, Fla., allowing four hits in seven innings, and is expected to be activated within a few days.

*Mets 3, Phillies 2: Gary Carter hit a tie-breaking single in the eighth inning and Dwight Gooden outdueled Shane Rawley to give New York a victory over visiting Philadelphia.

Gooden (2-0) allowed six hits, walked two and struck out 10 in his second complete game. Rawley (1-1) did not give up a hit until the fifth inning but left after 7 2/3, having yielded six hits.

*Astros 4, Reds 3: In Cincinnati, Phil Garner's two-run double triggered a four-run first and Houston held on for Bob Knepper's 100th victory.

Knepper (3-0) allowed four hits in 5 1/3 innings. Charlie Kerfeld pitched 2 1/3 innings before having his 25-inning scoreless streak (dating from last season) ended. Dave Smith took over in the ninth and picked up his fifth save.

Garner had a single and a double in four at bats. In the past five games, he has driven in 11 runs with 11 hits in 18 at bats.

Meanwhile, the Astros activated outfielder Jose Cruz, who sprained his right knee in an exhibition game, and sent outfielder Eric Bullock to Class AAA Tucson.

*Pirates 14, Cubs 8: In Chicago, the Pirates scored seven runs with two outs in the fourth inning, including R.J. Reynolds' grand slam on his 26th birthday, and Pittsburgh rolled to its fifth straight victory.

Also homering for the Pirates were Joe Orsulak (first of his career), Bill Almon and Sid Bream. Leon Durham, Shawon Dunston (five for five) and Ryne Sandberg homered for the Cubs.

*Giants 6, Padres 5: Chris Brown's two-run homer in the seventh inning completed San Franciso's rally from a 5-0 deficit against visiting San Diego.