Boston just scratched lefty Jon Lester as their starting pitcher in the nightcap of this double-header.
Daisuke Matsusaka is having back problems and won't br able to start on Friday as scheduled - so the Red Sox moved Lester back and will start him Friday. Tim Wakefield will start the 4 p.m. (PDT) game tonight.
As for the Mariners, they'd starting Felix Hernandez, though the change in Boston pitchers might change their lineup. Stay tuned.