BALTIMORE — With two pitchers returning to the starting rotation for their respective teams, it was clear Saturday night’s game had the potential to become an offensive explosion, especially with the temperature soaring to the mid-80s in downtown Baltimore. Twenty-one runs, 24 hits, and nine home runs later, the Orioles (6-18) bested the Boston Red Sox, 12-9, in a game filled with offense and short on pitching. Baltimore’s 12 runs was a season high, besting their eight-run effort against the Oakland Athletics on April 18. As he has for the entire 2010 season, Ty Wigginton led the offense with two home runs, including a solo blast in the fifth inning that ignited a six-run explosion that put the Orioles in front for good. Wigginton leads the club in nearly every run-producing category imaginable including home runs (8), runs batted in (14), average (.324), slugging percentage (.721), and on-base percentage (.413). “I’m just executing my plan,” he said. “I try to come up with the best approach [at the plate] and stick with it. I’m executing it more times than I’m not.” Manager Dave Trembley believes there’s a far simpler explanation, especially with Brian Roberts being on the disabled list for