Colt Keith hit a tiebreaking two-run homer in the seventh and the host Detroit Tigers stretched their winning streak to five games with a 4-2 victory over the Tampa Bay Rays on Tuesday night.Keith also had an RBI single for Detroit, which will go for a three-game sweep Wednesday afternoon. Spencer Torkelson homered for the other Tigers run.Starting pitcher Jack Flaherty gave up two runs in 6 1/3 innings and struck out eight. Tommy Kahnle (1-1) got two outs and picked up the win. Will Vest struck out three in the ninth for his 15th save.Rays starter Ryan Pepiot gave up two runs in six innings with six strikeouts. Jonathan Aranda homered and scored both Rays runs.Aranda gave the Rays an early lead as the second batter of the game, lifting a Flaherty fastball over the right field wall for his 11th homer.Tampa Bay had two on and no one out in the second, but Flaherty escaped that jam. He wasn’t so fortunate in the third, as Aranda smacked a one-out double and Josh Lowe brought him home with a two-out single.