Adam Wainwright began a rehab assignment on Thursday to prepare for the possibilty that he'll return as the Cardinals' closer, according to The St. Louis Post-Dispatch. Wainwright will start Friday night for the Cardinals' Class AAA affiliate in Memphis, with his rehab set for lower pitch counts, shorter and more frequent appearances. "We moved him up since he's probably going to come back as a reliever," General Manager John Mozeliak said. "It's not set. There's a chance before he comes back that we have a solution, and it's not a need. Then he'll come back as a starter. We want to be prepared. Right now, everything is on the table."