Red Sox prospect Justin Masterson will make his second major league start tonight against the Kansas City Royals. After the start, he’ll likely be replaced by Bartolo Colon, who is due for a call up from Pawtucket.

The Mariners suspended top prospect and former Erik Bedard trade-bait Carlos Triunfel indefinitely for a violation of team rules.

The Mariners also promoted outfielder Jeremy Reed to take catcher Jeff Clement's roster spot.

Rangers rookie Doug Mathis makes his first major league start in place of the ailing Kevin Millwood. 

The Nationals promoted closer prospect Martin Beno to High-A Potomac.