BOSTON — Dustin Pedroia launched two home runs, scored four runs and claimed five RBI in leading the Red Sox to an 18-6 win over the Blue Jays Tuesday night at Fenway Park, allowing Tim Wakefield to claim his 200th career victory. The win, coupled with the Orioles’ 4-2 victory over the Rays, pushed the Sox’ Wild Card lead over Tampa Bay back up to four games. The 45-year-old Wakefield, who becomes the 108th pitcher in major league history to win 200 games, allowed five runs over six innings, striking out six and walking two while throwing 96 pitches. The knuckleballer trailed 5-4 heading into the fourth inning, but back-to-back homers by Jacoby Ellsbury and Pedroia would give the Sox the lead for good. Pedroia would strike again in the sixth, ripping his second round-tripper of the game over the left field wall for a three-run home run and his 20th of the season. It allowed the second baseman to become the seventh player in Red Sox history to claim at least 20 homers and 20 stolen bases in a season. He finished with four hits, the second time this season he has accomplished the feat with his 4-for-5 performance on July 26 against the Royals serving as the other occasion. The top two hitters in the Sox’ lineup, Ellsbury and Pedroia, combined to go 8-for-9 with eight runs and eight RBI. Adrian Gonzalez, Jarrod Saltlamacchia, Carl Crawford and Marco Scutaro each chipped in with two hits apiece. Saltalamacchia also had four RBI. It would be the most runs scored by the Red …