"We continually try to run the best lineup out there on a particular day," said manager Bob Melvin, "and some of Lackey's splits suggest another righty would be in there -- so it makes sense to get a hot-hitting right-hander for us, and for us to get both our catchers in the lineup. It's just kind of a daily nuance we look at."
The veteran Lackey is sporting reverse splits this year. Right-handers are hitting .300 against him, while left-handers are batting .242.
Norris went 1-for-2 with two walks in Sunday's 3-2 win in 10 innings over Boston to raise his average to .371.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.