I previewed the potential call-ups for both the American League and National League, but now that the rosters have expanded, the speculation is over and the promotions are happening. Here we'll track all of the notable prospects who have already gotten the call, as well as links to any news or analysis of the moves.
Miami - Brian Flynn accompanied Rob Brantly on his return to the majors, and will make his major league debut on Wednesday, notes FishStripes.com. They also promoted lesser prospects Arquimedes Caminero and Brad Hand to work out of their bullpen.
New York (N) - No significant September call-ups.
Chicago (N) - The Cubs called up a few lesser prospects, including Justin Grimm, who they acquired in the Matt Garza deal this season, but they don't plan to call up former top prospects Brett Jackson or Josh Vitters, both of whom have fallen out of favor with the new administration, notes Carrie Muskat of MLB.com.
Colorado - No significant September call-ups.
Los Angeles (N) - No significant September call-ups.
San Francisco - No significant September call-ups.
New York (A) - No significant September call-ups.
Tampa Bay - No significant September call-ups.
Chicago (A) - Andre Rienzo and Erik Johnson have been called up to join the big league rotation, and Charlie Leesman will get work out of the bullpen. Infield prospect Marcus Semien is getting a chance to continue his breakout season.
Cleveland - No significant September call-ups.
Kansas City - No significant September call-ups.
Minnesota - No significant September call-ups.
Houston - None were officially called up in September, but Jonathan Villar, Max Stassi, L.J. Hoes, and Jarred Cosart will all get a chance to play this fall. George Springer has not been among those to receive a promotion, despite a fantastic season in Triple-A and tons of playing time for young players in the majors.
Texas - No significant September call-ups.