ARLINGTON, Texas -- George Springer drilled a grand slam and the Houston Astros completed a sweep by blasting the Texas Rangers 12-2 Wednesday afternoon in the series finale.The Astros improved to a season-best 38 games above .500 with their 11th win in the last 13 contests. Houston moved within a half-game of Cleveland for the best record in the American League, pending the result of the Indians' game against the Minnesota Twins later Wednesday.The Rangers suffered their sixth straight loss and are now assured of only their second losing season since 2009.The Astros reached double figures in scoring in all three games and outscored Texas 37-7. Houston also scored at least 11 in all three games, a first in franchise history.Diamondbacks 4, Giants 3PHOENIX -- Right fielder J.D. Martinez tied the National League record for homers in September and Arizona scored three runs in the ninth inning for a walk-off victory.Martinez led off the ninth inning with a solo homer, his 16th blast of September, to close the deficit to 3-2 and tie Ralph Kiner for the league record for homers in the month.Jake Lamb and A.J. Pollock followed Martinez's homer with singles off Sam Dyson (3-3), and a walk loaded the bases. John Ryan Murphy's fielder's choice scored the tying run, and Dyson then walked in the winning run.Athletics 6, Mariners 5OAKLAND, Calif. -- Mark Canha hit a solo walk-off home run with one out in the bottom of the ninth inning, powering Oakland to a victory over Seattle.Canha lined reliever Shae Simmons' 1-0 pitch over the left field fence for his fifth home run of the season and second career walk-off homer, both this season. Simmons (0-1) took the loss, while A's reliever Blake Treinen (3-4) got the win after pitching a scoreless ninth.The A's snapped a franchise-record eight-game losing streak to the Mariners.Rockies 15, Marlins 9DENVER -- Trevor Story had a pair of two-run hits after Miami intentionally walked Nolan Arenado, helping Colorado win the rubber game of their series.The victory helped the Rockies move closer to a postseason berth for the first time since 2009.After driving in three runs Tuesday, Story had four RBIs, raising his total for the season to 80. He had a two-run single in the six-run second inning and a two-run double in Colorado's three-run fourth. Story has hit safely in six straight games and 16 of his past 18.