Baltimore Orioles (70-59) vs. Boston Red Sox (77-55), Fenway Park, 7:10 p.m.
Wei-Yin Chen (7-6, 3.19) vs. Felix Doubront (9-6, 3.79)
KEYS TO THE GAME:
This is the first of 10 games between the Orioles and Red Sox between now and the end of the season. The Orioles must win the majority of them to have a chance to make the postseason.
Chen has allowed three or fewer runs in eight of his last nine starts. Another strong start is a necessity.
NEWS AND NOTES:
Adam Jones is 2-for-14 against Doubront. Matt Wieters is 1-for-13. Chris Davis is 6-for-12.
Chen is 2-1 with a 2.96 ERA in four starts against Boston.
The Orioles must make a decision on Wilson Betemit. His 20-day rehab period ended on Monday.