Pitching Matchups Friday: Wade Miley (2-0, 2.37) vs. Jason Marquis (2-2, 4.20) Saturday: Patrick Corbin (3-0, 1.91) vs. Clayton Richard (0-3, 7.94) Sunday: Ian Kennedy (1-2, 4.78) vs. Edison Volquez (2-3, 6.39) After a very disappointing finish to their seven-game homestand, the Diamondbacks head back on the road to kick off a six-game road trip …