It's September, which means winning now officially takes a village.
Beginning today, teams can expand their rosters to 40, meaning that any player on the 40-man roster can be automatically called up to the big leagues.
Whether it's a contending team looking for a boost, or a rebuilding team looking to give a prospect an extended look, the roster calculus of every club changes starting today.
The clubhouses will be cramped. The box scores will be crowded. And little-known names can affect the postseason races unlike at any point in the season.
Here is a complete list of the Top 30 Prospects that each team has called up:
A's

1. Franklin Barreto, SS/2B (MLB No. 34)
   
2. Renato Nunez, 3B/OF
   
3. Joe Wendle, 2B
   Barreto enjoyed a two-week stint with the A's earlier this summer when second baseman Jed Lowrie  was out of action, batting .190 with two home runs before returning to Triple-A Nashville. Barreto responded by batting .304 with seven home runs in his final 43 games with the Sounds, including .349 in August. More »
   Braves
   
4. Luiz Gohara, LHP (MLB No. 88)
   
5. Max Fried, LHP
   
6. Rio Ruiz, 3B
   Gohara, a big southpaw, featured an impressive slider as he proved successful while pitching for Class A Advanced Florida, Double-A Mississippi and Triple-A Gwinnett. He produced a 2.62 ERA and notched 147 strikeouts over 123 2/3 innings in the Minors this year. Gohara was acquired from the Mariners in January via a trade that sent Mallex Smith and Shae Simmons to Seattle.
   He ranks as the Braves' eighth-best prospect per MLBPipeline.com. Fried, 23, has allowed four earned runs in 6 2/3 frames across four appearances. Ruiz, 23, is batting .175 with two home runs and nine RBIs in 31 games for the big league club this year, but he batted .247 with 16 homers and 56 RBIs in 103 games for Triple-A Gwinnett. More »
   Blue Jays
   
7. Teoscar Hernandez, OF
   
8. Richard Urena, SS
   Urena will eventually made his Major League debut, and with Troy Tulowitzki out for the season, there is an opportunity for playing time. More »
   Cardinals
   
9. Jack Flaherty, RHP (MLB No. 50)
   
10. Harrison Bader, OF (MLB No. 98)
    
11. Sandy Alcantara, RHP
    Flaherty went 14-4 with a 2.18 ERA in 25 starts between Double-A and Triple-A, notching nearly a strikeout per inning. Bader hit .283 with 20 homers and 15 steals in 123 games for Triple-A Memphis this year. The hard-throwing Alcantara went 7-5 with a 4.31 ERA in 25 games (22 starts) with Springfield and had 106 strikeouts with 54 walks in 125 1/3 innings. More »
    Cubs
    
12. Victor Caratini, C/1B
    
13. Jen-Ho Tseng, RHP
    
14. Dillon Maples, RHP
    
15. Rob Zastryzny, LHP
    Caratini, 24, had a monstrous year (.342/.393/.558, 10 HR, 83 G) for Triple-A Iowa. He also hit .263 in 17 games in two separate stints in the big leagues earlier in the summer. Maples began this season at Class A Advanced Myrtle Beach, moved up to Double-A Tennessee, then Triple-A Iowa. In 52 relief outings, he struck out 100 batters over 63 1/3 innings and posted a 2.27 ERA. Zastryzny made his big league debut last year, posting a 1.13 ERA in 16 innings. He's spent the majority of the season with Triple-A Iowa and has recorded 40 strikeouts in 47 innings. More »
    D-Backs
    
16. Jimmie Sherfy, RHP
    
17. Christian Walker, OF
    Sherfy put up impressive numbers for Triple-A Reno, considering how hitter-friendly the Pacific Coast League is. The 25-year-old turned in a 3.12 ERA in 44 appearances and struck out 61 in 49 innings this year for the Aces. Meanwhile, Walker spent the summer punishing PCL pitchers, batting .309/.382/.597 with 32 home runs, 104 runs scored and 114 RBIs for Reno on his way to winning league MVP honors.
    Dodgers
    
18. Walker Buehler, RHP (MLB No. 11)
    
19. Alex Verdugo, OF (MLB No. 27)
    
20. James Farmer, C/3B
    Buehler only had five professional innings under his belt a year ago, but he has skyrocketed up the rankings since then. The Vanderbilt alum is expected to help in relief, although his future is certainly as a starter. Meanwhile, while Joc Pederson finished sixth in National League Rookie of the Year Award voting two years ago, Corey Seager won the award last year and Cody Bellinger is the clear favorite this year, the Dodgers are taking the wraps off their candidate for next year with Alex Verdugo getting a callup. Farmer appeared in 12 games with the Dodgers in July and August, mostly as a pinch-hitter. He spent the majority of his campaign at Double-A and Triple-A, slashing .317/.375/.476 between the two stops. More »
    Giants
    
21. Austin Slater, OF
    
22. Reyes Moronta, RHP
    Slater, who recovered rapidly from a right groin strain, is likely to play every other day, while Moronta (3-1, 2.92 ERA with five saves in 34 games at Sacramento, Double-A Richmond and in the Arizona Rookie League) will appear in shorter stints. More »
    Indians
    
23. Francisco Mejia, C (MLB No. 14)
    
24. Greg Allen, OF
    
25. Shawn Morimando, LHP
    Mejia, 21, was batting .297 with 14 home runs and 52 RBIs in 92 games for Akron this season. He was named to the Eastern League midseason and postseason All-Star teams. Allen hit .264 with two home runs and 24 RBIs in 71 games for Akron this season and stole 21 bases in 23 attempts for the RubberDucks. Morimando is 10-9 with a 4.41 ERA in 26 starts for Columbus while leading the International League in innings pitched (159 1/3), complete games (four) and shutouts (three). The 24-year-old also finished seventh in strikeouts (128) and tied for seventh in wins. More »
    Mariners
    
26. Andrew Moore, RHP
    
27. Dan Vogelbach, 1B
    Moore is returning for his fourth stint with the Mariners this year. The 23-year-old rookie is 1-3 with a 6.34 ERA in seven outings, including six starts, and is expected to work out of the bullpen for now. More »
    Mets
    
28. Tomas Nido, C
    
29. Jacob Rhame, RHP
    
30. Jamie Callahan, RHP
    Rhame, 24, was acquired for Curtis Granderson when the Mets sent the right fielder to the Dodgers on August 19. Callahan, 23, was part of a package New York received for Addison Reed in a trade with the Red Sox on July 31. Rhame can get his fastball up to triple digits, but he has struggled in the Minors when forced to used his secondary pitches. Callahan sports a fastball that reaches 96 mph and a hard cutter he uses as an offspeed pitch. He posted a 3.63 ERA and struck out 11.4 batters per nine innings for three teams across two Minor League levels this season. More »
    Nats
    
31. Victor Robles, OF (MLB No. 3)
    
32. Erick Fedde, RHP
    
33. Andrew Stevenson, OF
    
34. Rafael Bautista, OF
    
35. Raudy Read, C
    
36. Pedro Severino, C
    Robles, 20, was signed out of the Dominican Republic in 2013. Between Class A Advanced Potomac and Double-A Harrisburg this season, he posted a .300/.382/.493 slash line with 10 home runs and 27 stolen bases in 114 games.
    Robles is a five-tool player who has displayed the potential to become a plus-hitter while already possessing plus-plus speed. He is also ranked by MLBPipeline.com as the No. 1 outfield prospect in baseball, with outstanding range and a strong arm.
    Fedde made his big league debut on July 30 this season after making his pro debut in 2015. The 24-year-old right-hander fanned 79 hitters in 90 1/3 innings between Double-A Harrisburg and Triple-A Syracuse. Read has nearly doubled his previous single-season homer mark this year. He hit 17 homers in 108 games for Double-A Harrisburg after matching his single-season high last year with 9 homers for Class A Advanced Potomac. Severino played a handful of games for the Nats in July and August, but he spent the majority of his year at Syracuse, where he hit .242 in 59 games. More »
    Orioles
    
37. Chance Sisco, C (MLB No. 47)
    
38. Austin Hays, OF (MLB No. 97)
    
39. Tanner Scott, LHP
    
40. Gabriel Ynoa, RHP
    A career .311 hitter over five years in the Minors, Sisco's average dropped to .267 at Triple-A Norfolk this year, where he posted a .340 on-base percentage and slugged .395. This is Sisco's first taste of the big leagues. Scott, a power left-hander, started 24 games for Double-A Bowie and struck out 87 in 69 innings. The 23-year-old posted a 2.22 ERA and will make his big league debut in his first Major League appearance. Ynoa made four appearances for the Orioles this year before the organization called him up in September. The 24-year-old right-hander struck out 12 and walked two in 12 2/3 innings. More »
    Phillies
    
41. J.P. Crawford, SS (MLB No. 57)
    Crawford hit .280 with 16 doubles, five triples, 13 home runs, 42 RBIs and a .904 OPS in 312 plate appearances since June 20. He walked 43 times and struck out 55 times. Crawford recently started games at third base and second base, but his future remains at shortstop.
    More »
    Pirates
    
42. Edgar Santana, RHP
    Santana made his Major League debut in June, appearing in nine games for Pittsburgh in his initial big league stint. Although the 25-year-old posted a 6.52 ERA in his first 10 appearances for the Pirates, he owned a 2.79 mark in 44 appearances (58 innings) for Triple-A Indianapolis, striking out 54 batters and issuing only 12 free passes.
    Rays
    
43. Ryne Stanek, RHP
    Stanek posted a 1.21 ERA in 44 2/3 innings out of the 'pen for Triple-A Durham. The 26-year-old struck out 60 and issued 16 walks in 37 appearances in the Minors this year. More »
    Rangers
    
44. Willie Calhoun, 2B/OF (MLB No. 63)
    
45. Yohander Mendez, LHP
    Mendez made 24 starts for Double-A Frisco this year, going 7-8 with a 3.79 ERA, a 1.14 WHIP and 124 strikeouts in 137 2/3 frames. The 22-year-old southpaw fired a seven-inning shutout against Arkansas on June 3. Mendez made his Major League debut in 2016, appearing in two games for the Rangers. More »
    Reds
    
46. Rookie Davis, RHP
    
47. Keury Mella, RHP
    
48. Ariel Hernandez, RHP
    Davis made five starts for Cincinnati earlier in the year, but he was optioned in May and spent most of his campaign in the upper minors while also missing time with a back injury. Hernandez has allowed nine earned runs in 15 1/3 innings across 10 appearances for the Reds this season. The 25-year-old hurler has struggled with his control at times (10 walks) and with the long ball (five homers allowed), but he has struck out 21 batters in limited action. More »
    Red Sox
    
49. Sam Travis, 1B
    
50. Tzu-Wei Lin, INF
    
51. Austin Maddox, RHP
    Travis is hitting .279 with five doubles in 2017 for Boston. The 24-year-old batted .270 with six homers and 24 RBIs for Pawtucket this year. Lin made his big league debut earlier this season. He hit .280 with two triples and two RBIs in 50 at-bats in his first stint with the Red Sox. Maddox has yet to allow a run in three appearances in the Major Leagues in 2017. He is 2-3 with eight saves and a 2.92 ERA in 37 games split between Double-A Portland and Pawtucket this season. More »
    Rockies
    
52. Ryan McMahon, 1B/2B/3B (MLB No. 59)
    
53. Tom Murphy, C
    "It depends on the game, how each of these guys will be used," Rockies manager Bud Black said. "But they're here to help us win a game. Each and every night there might be an opportunity for one of these six guys to help contribute to a Rockies win." More »
    Tigers
    
54. Jeimer Candelario, 3B/1B, (MLB No. 84)
    The Cubs sent Candelario to the Tigers before the non-waiver Trade Deadline in a package for Justin Wison and Al Avila. Candelario hit 15 homers this year in 100 Triple-A games (81 with Iowa, 29 with Toledo) and went 1-for-2 in his first big league Tigers game on Aug. 8.
    White Sox
    
55. Carson Fulmer, RHP
    Fulmer made his first Major League start on Aug. 21 against the Twins, allowing six runs on four hits and three walks over 1 1/3 innings for the loss. He was 7-9 with a 5.79 ERA and 96 strikeouts in 126 innings over 25 starts with Triple-A Charlotte this season. More »
    Yankees
    
56. Miguel Andujar, 3B, (MLB No. 97)
    
57. Christopher Austin, 1B
    
58. Domingo German, RHP
    
59. Ben Heller, RHP
    Andujar went 3-for-4 with four RBIs in his big league debut on June 28. He makes his third Major League stint after hitting .315 in 480 regular-season at-bats for Double-A Trenton and Triple-A Scranton/Wilkes-Barre. Austin's season got off to a slow start after breaking a bone in his left foot during Spring Training. He hit 10 homers and drove in 32 runs in 47 games with Triple-A Scranton/Wilkes-Barre this year. German made five appearances for the Yankees this year, but spent most of the season with Triple-A Scranton/Wilkes-Barre. The right-hander posted a 2.83 ERA and 81 strikeouts in 76 1/3 innings with the RailRiders. Heller, acquired by the Yankees from Cleveland in last year's Andrew Miller deal, has been dominant at Triple-A, striking out 82 in 56.1 innings while posting a 2.88 ERA and holding opposing hitters to a .172 average. More »