Red Sox starters have a dreadful 5.76 earned run average, which ranks 28th among the 30 major league teams. Jon Lester (6.51) and Josh Beckett (5.85) have been the biggest disappointments, though Beckett pitched decently in his last outing in Seattle. This week will see the return of Daisuke Matsuzaka (12.79 ERA), who made two starts before heading to the disabled list with a sore shoulder. The Boston pitching staff will be tested this week at Fenway against a Toronto team that ranks first in the majors in runs scored.