Contenders looking to bolster their bench and basement-dwellers hoping to give a few prospects a chance with the big club will now have the opportunity to do so, as MLB teams expand their rosters to 40 players in the annual September call-ups.
Here, we'll track every team's call-ups as they happen as the race to the postseason enters its last month.
All updates via MLB.com.
Players Added: LHP Tony Sipp, RHP David Hernandez
Notes: In 48 games with the D-Backs this season, Sipp has a 3.86 ERA, 1.44 WHIP and 37 strikeouts in 32.2 innings. He'll serve as a lefty specialist. Hernandez was less effective after a great 2012 season, but he looked good during his stint in Triple-A Reno.
Players Added: RHP Freddy Garcia, RHP Kameron Loe
Notes: The 36-year-old veteran, who the Braves acquired from Baltimore, held a 5.77 ERA and 1.36 WHIP in 10 starts for the Orioles. He'll work out of the bullpen in Atlanta.
Players Added: C Steve Clevenger, C Chris Snyder, LHP Zach Britton
Notes: Clevenger and Snyder will give the Baltimore Orioles nice catching depth as they make their push toward the postseason.
Players Added: OF Quintin Berry, RHP Rubby De La Rosa, C Ryan Lavarnway
Notes: Berry doesn't exactly swing the meanest bat, but he has good speed and should be a nice base-running option off the bench. Lavarnway has spent some time with the Red Sox this season.
Players Added: RHP Alberto Cabrera
Notes: Cabrera got knocked around in 25 appearances for the Cubs last season as he sported a 5.40 ERA, but at 10-6 with a 3.79 ERA in the minors this year, he should be a solid long reliever.
Players Added: C Bryan Anderson, LHP Charlie Leesman
Notes: Leesman made his major league debut for the Chicago White Sox on August 9, pitching five innings and giving up just one earned run and four hits while walking five and striking out eight.
Players Added: 2B Henry Rodriguez, OF Derrick Robinson, 3B Neftali Soto, OF Billy Hamilton, RHP Curtis Partch
Notes: Rodriguez can play three infield positions and will give the Cincinnati Reds a useful utility option.
Players Added: 2B Jose Ramirez, C Kelly Shoppach, RHP Blake Wood, LHP Nick Hagadone, RHP Preston Guilmet, LHP Clay Rapada
Notes: Ramirez is an exciting young prospect who can play in a utility role and swipe his fair share of bases. Wood might see some time in the rotation, while Hagadone and Guilmet will head to the bullpen.
Players Added: INF Josh Rutledge
Notes: Rutledge failed to live up to expectations as the starter at second base for the Rockies earlier this season, but he brings with him a tantalizing skill set. In 38 games at Triple-A Colorado Springs, the 24-year-old hit .371/.444/.587 with 17 doubles and four homers.
Players Added: OF Nick Castellanos, RHP Evan Reed, INF Danny Worth, RHP Luke Putkonen
Notes: Castellanos is an excellent outfield prospect, while Reed will slide into the bullpen and Worth is capable of filling a utility role.
Players Added: RHP Jorge De Leon, OF Trevor Crowe
Notes: De Leon, who made two uninspiring appearances with the Astros earlier this season, will be used in a middle relief role. He had a 3.46 ERA and 0.990 WHIP across Double- and Triple-A this season but recently looked unhittable at the latter level.
Players Added: LHP Francisley Bueno, C Brett Hayes
Notes: Bueno is 32 and appeared in 18 games for the Royals last season. He also saw action in one game this year, earning a win against the Red Sox in 2.1 scoreless innings.
Players Added: RHP Ryan Brasier
Notes: Brasier, who had a cup of coffee with the Angels earlier in the year, held a 4.13 ERA and 1.500 WHIP in 38 Triple-A appearances this season. He won't serve as much more than an extra middle relief arm.
Players Added: C Drew Butera, RHP Stephen Fife, SS Dee Gordon, RHP Peter Moylan, OF Scott Van Slyke
Notes: Fife is the intriguing add here. In 14 career major league starts, the 26-year-old has posted a 2.55 ERA and 1.34 WHIP with the Dodgers. He'll likely provide long relief coverage at first, but he could eventually be used as a fifth starter.
Butera and Gordon will bring major league experience and depth, while Moylan and Van Slyke will be used sparingly.
Players Added: RHP Chris Hatcher, LHP Zach Phillips
Notes: Both Hatcher and Phillips will slide into the Miami Marlins' bullpen.
Players Added: RHP Donovan Hand, RHP Michael Blazek
Notes: Hand has spent time with the Milwaukee Brewers this season and will likely be the team's long reliever.
Players Added: RHP Victor Black, LHP Tim Byrdak, 3B Zach Lutz
Notes: Black was acquired in the trade that sent Marlon Byrd and John Buck to the Pittsburgh Pirates. He will slot into the team's bullpen.
Players Added: C J.R. Murphy, INF David Adams, RHP Brett Marshall, RHP Dellin Betances, LHP Cesar Cabral, RHP Preston Claiborne
Notes: Murphy will be the team's third catcher, while Adams will be a utility man off the bench. Marshall, Betances and Cabral are all bullpen options.
Players Added: LHP Pedro Figueroa, OF Michael Choice, INF Jemile Weeks, INF Andy Parrino
Notes: Figueroa is a bullpen option, while Choice is a promising prospect who should get some spot starts in the outfield and could carve out a role for himself if he impresses. Weeks is a former top prospect who was hitting .271/.376/.369 with 17 stolen bases at Triple-A. As someone who can play a variety of positions, he'll fill a utility role for the A's.
Parrino will add defense and versatility.
Players Added: INF/OF Michael Martinez, 2B Cesar Hernandez
Notes: Martinez is no stranger to the big club and will fill in as an all-around utility option.
Players Added: RHP Kyle Farnsworth, LHP Kris Johnson
Notes: Johnson will get the start for the Pittsburgh Pirates on Sunday.
Players Added: C Chris Robinson, LHP Tom Layne, RHP Burch Smith
Notes: Robinson was hitting a solid .282/.307/.320 and will provide nice depth at catcher.
Layne has a 2.45 ERA in 7.1 innings this season with the Padres. He'll be used in middle relief.
Players Added: RHP Tom Wilhelmsen
Notes: Seattle's former closer will give the team another option out of the bullpen, though surely not in the ninth inning.
Players Added: OF Adron Chambers
Notes: Chambers will bring speed off the bench for the St. Louis Cardinals as they chase the Pirates for the NL Central crown.
Players Added: C/OF Chris Gimenez, RHP Josh Lueke, OF/DH Delmon Young
Notes: Young started the season with the Philadelphia Phillies before being released. He'll add some pop off the bench for the Rays.
Players Added: C/1B Robinson Chirinos, RHP Cory Burns, OF Jim Adduci
Notes: Chirinos will give the Rangers depth at catcher, while Adduci was producing at an intriguing level, hitting .298/.381/.463 with 16 homers and 32 steals at Triple-A Round Rock.
Burns posted a 1.64 ERA in 11 innings for the Rangers earlier this season, and will give them another arm out of the bullpen.
Players Added: C Sandy Leon, RHP Erik Davis, LHP Ian Krol
Notes: Leon wasn't doing much with the bat at Double-A Harrisburg, but he'll give the Nationals some important depth behind the plate.