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 RBIs 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 plunked Carlos Correa to load the bases.

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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.