HOUSTON — Tarik Skubal kept up his stellar season with a sensational playoff debut and the Detroit Tigers got to Framber Valdez early in a 3-1 win over the Houston Astros in their AL Wild Card Series opener on Tuesday.The Tigers, swept in the American League Division Series in their last trip to the playoffs in 2014, got their first postseason win since Game 4 the 2013 AL Championship Series against Boston.Down 3-0 entering the ninth, Houston scored on Yanier Diaz’s RBI single and had the bases loaded when Jason Heyward hit a game-ending lineout against Beau Brieske. Game 2 of the best-of-three series is Wednesday in Houston.Skubal, the AL pitching Triple Crown winner, allowed just four singles and walked one in six innings. About the only hard hit by the Astros off him was one that hit him — the left was struck on his right wrist by Diaz’s second-inning comebacker.“It was a good challenge,” Skubal said. “It was fun. It was a ton of fun. I enjoyed it. It’s probably the most nervous I’ve been since my debut. That was also fun to deal with. What a game. It was fun, glad to come out with a win.”Yordan Alvarez, playing for the first time since spraining his right knee Sept. 22, doubled off Jason Foley starting the ninth inning. Pinch-runner Zach Dezenzo and …