HOUSTON -AP- Colby Rasmus hit a tie-breaking grand slam in the fifth inning to lead the Houston Astros to an 8-3 win over the Boston Red Sox on Saturday that snapped a four-game skid.He drove in a fifth run with a double in Houston's three-run eighth for his most RBI since he had six on June 2, 2011. The game was tied a 1-1 and Clay Buchholz (0-2) had retired eight straight before walking Luis Valbuena with no outs in the fifth.George Springer singled with two outs before Buchholz plunkedCarlos Correa to load the bases.Rasmus then launched a 93 mph fastball with two strikes to the seats in right-center field for his fifth career grand slam and Houston's second this season to make it 5-1.Mike Fiers (2-1) allowed five hits and two runs with six strikeouts in 5 1/3 innings for his second win in a row.Buchholz yielded six hits and five runs while striking out six in 5 2/3 innings to remain winless in four starts this season. It's his first career loss to the Astros in five starts, which included two complete games. He entered with a 1.38 ERA with 39 strikeouts against Houston.Mookie Betts hit a leadoff single and advanced to second on an error by Fiers on a pickoff attempt. Dustin Pedroia walked before the RBI single by David Ortiz made it 1-0.Houston evened it up in the second inning when Marwin Gonzalezscored on a groundout by Jason Castro.Fiers settled down after the single by Ortiz, retiring 15 of the next 16 batters before a double by Pedroia to start the sixth inning.A single by Travis Shaw with one out in the inning loaded the bases and chased Fiers.He was replaced by Will Harris, and Brock Holt hit a sacrifice fly that scored Pedroia to cut the lead to 5-2. But Harris retired Chris Young to limit the damage.The Red Sox added a run on a double by Josh Rutledge with two outs in the eighth.