Right-handers Mike Scott and Dave Smith pitched a five-hitter as the Houston Astros defeated Cincinnati, 4-1, last night to end the Reds' seven-game winning streak.

Scott (1-0) gave up three hits through eight innings, but allowed singles to Dave Parker and Wayne Krenchicki in the ninth to bring on Smith, who got his second save. Jay Tibbs (0-3) was the loser.

With the score tied, 1-1, Houston's Bill Doran led off with a double and went to second on Kevin Bass' infield out. Denny Walling then singled in Doran. Walling scored on Jerry Mumphrey's triple.

Cincinnati took a 1-0 lead in the fifth after Scott, who retired 12 of the first 14 he faced, gave up a leadoff single to Dave Concepcion. Tom Foley singled and Concepcion took third when Mumphrey mishandled the ball. Concepcion scored on Dann Bilardello's infield out.

Houston ended a string of 20 consecutive scoreless innings by Cincinnati pitchers by getting an unearned run in the fifth. Mumphrey reached on a one-out error by Foley at second base and went to third on Phil Garner's single. A walk to Alan Ashby loaded the bases and Mumphrey scored on Craig Reynolds' grounder.

Bass' homer in the eighth was the Astros' first in the Astrodome this season.