Alexander will serve as the Rays' bulk reliever Sunday against Arizona, Marc Topkin of the Tampa Bay Times reports.
Tampa Bay recalled Alexander from Triple-A on Saturday in the wake of Zack Littell's (shoulder) move to the 15-day injured list. While Alexander won't officially start Sunday's contest, he'll be the Rays' primary pitcher behind opener Drew Rasmussen. Alexander has allowed two runs across his last four big-league appearances, racking up 15 strikeouts across 14.1 innings.