Baz (elbow) struck out three and allowed one earned run on five hits and two walks over 3.1 innings Thursday in the third start of his minor-league rehab assignment with Triple-A Durham.
Littell didn't factor into the decision Thursday, allowing four runs on seven hits and a walk over five innings against the Red Sox. He struck out three.
Williams is slashing .336/.410/.571 with five home runs, nine steals, a 24.6 percent strikeout rate and a 72.3 percent contact rate in 29 games for Double-A Montgomery.
Caminero made his first start of the season at second base with Triple-A Durham on Tuesday and went 3-for-6 with a home run, two RBI and an additional run.
Walls (hip) reported to the Rays' spring training facility in Port Charlotte, Fla. earlier this week and will go through workouts for the next 10-to-14 days before beginning a rehab assignment, Marc Topkin of the Tampa Bay Times reports.
Rays manager Kevin Cash said Tuesday that Lowe (oblique) will rejoin the team in Tampa Bay and will resume swinging the bat before heading back out on a minor-league rehab assignment in short order, Marc Topkin of the Tampa Bay Times reports.
Civale came away with a no-decision in Tuesday's 5-4 extra-innings loss to the Red Sox, giving up three runs on five hits over five innings. He struck out six without walking a batter.
McKay will be shut down for 5-to-6 weeks after being diagnosed with a flexor/pronator strain with an accompanying UCL sprain in his left elbow, Marc Topkin of the Tampa Bay Times reports.
Eflin (3-4) earned the win Monday, allowing three runs on six hits while not walking a batter over five innings against the Red Sox. He struck out two.
Fairbanks was unavailable to pitch Monday night against the Red Sox due to a cut on his right index finger, Marc Topkin of the Tampa Bay Times reports.