The Rays’ rotation remains a fluid situation heading into the next week. RHP Alex Cobb had his start pushed back after suffering a crack along the edge of the fingernail of his middle finger that prevents him from throwing his curveball without pain. Cobb’s injury allowed RHP Alex Colome to make his major league debut on Thursday and pushed LHP Matt Moore’s start back to today to open a three-game series in Cleveland. RHP Jeremy Hellickson will take the mound on Sunday, while Saturday’s starter remained “TBA’’ on the Rays’ lineup card until late Thursday when manager Joe Maddon announced RHP Chris Archer would be called up from Triple-A Durham today and start Saturday. “He did a good job last year and it seems like we are giving an audition to everybody who deserves the chance,” Maddon said. The Rays will need to make a corresponding move today. Cobb is scheduled to throw in the bullpen on Saturday and hopes his finger is healed enough for him to make Tuesday’s start. The finger was wrapped on Thursday, and Cobb said he has been using healing cream to accelerate the process. Though Cobb is able to throw his fastball without incident and has little issue with the change-up, he is staying away from throwing any off-speed pitches during his workouts.