2015 Major League Baseball postseason

1. Kansas City Royals – AL Central champions, 95–67[2]
2. Toronto Blue Jays – AL East champions, 93–69[3]
3. Texas Rangers – AL West champions, 88–74[4]
4. New York Yankees – 87–75[5]
5. Houston Astros – 86–76[6]

1. St. Louis Cardinals – NL Central champions, 100–62[7]
2. Los Angeles Dodgers – NL West champions, 92–70[8]
3. New York Mets – NL East champions, 90–72[9]
4. Pittsburgh Pirates – 98–64[10]
5. Chicago Cubs – 97–65[11]

This was the first postseason meeting between the Astros and Yankees, and was the first postseason appearance by the Astros since 2005. The Astros shut out the Yankees 3–0 to advance to the ALDS. Both teams would meet again in the ALCS in 2017, 2019, and 2022, all won by the Astros.

The Cubs shut out the Pirates 4–0 to advance to the NLDS. This was the second straight year the Pirates were shutout in the Wild Card Game. As of 2022, this is the last postseason appearance by the Pirates, who now have the longest active postseason drought amongst National League teams.

Kansas City won the series, 3–2.

The Royals rallied from a 2–1 series deficit to defeat the Astros in five games and return to the ALCS for the second straight year.

Both teams split the first two games in Kansas City — the Astros stole Game 1 on the road, while the Royals rallied in the sixth and seventh innings of Game 2 to even the series headed to Houston. Dallas Keuchel and the Astros' bullpen helped the Astros prevail 4–2 in Game 3 to take a 2–1 series lead, and were one win away from returning to the LCS for the first time since 2005. However, their lead would not hold. In Game 4, the Astros held a 6–2 lead after seven innings and looked poised to close out the series. Then, the Royals offense took apart the Astros bullpen, as they scored five unanswered runs to regain the lead. Eric Hosmer hit a two-run home run to increase the Royals' lead in the top of the ninth, and then the Royals' bullpen closed out the game in the bottom of the inning. This was the second straight year where the Royals down four runs and six outs away from elimination, were victorious. The Royals closed out the Astros with a convincing 7–2 victory thanks to a stellar pitching performance from Johnny Cueto, who was only two pitches away from pitching a perfect game.

The Astros would make their next postseason appearance in 2017, where they went on to win the World Series.

Toronto won the series, 3–2.

This was the first postseason meeting between the Rangers and Blue Jays. The Rangers took a 2–0 series lead, but the Blue Jays rallied to tie the series. The Blue Jays defeated the Rangers in Game 5 to return to the ALCS for the first time since 1993. This was the first playoff series win by the Blue Jays since the 1993 World Series.

The Rangers stole the first two games in Toronto - they won by two runs in Game 1, and prevailed by two runs again in Game 2 after an ugly 14-inning affair. When the series shifted to Arlington, however, the Blue Jays would take Game 3 convincingly to avoid a sweep, and then took Game 4 by an 8–4 score to send the series back to Toronto. Game 5 of the series was notable for the events that transpired in the seventh inning - the Rangers made three consecutive errors, allowing the Blue Jays to tie the game at 3 runs each. Then José Bautista hit a game-sealing 3-run home run, and before running the bases, flipped his bat in celebration. Both benches cleared for a brief scuffle between both teams, but it was resolved shortly after. The Blue Jays closed out the series in the top of the ninth to advance. This was the third time a team won a best-of-five series after losing the first two games at home, and the second time in the 2–2–1 format.

Both teams would meet again in the ALDS the next year, which the Blue Jays won in a sweep.

Chicago won the series, 3–1.

This was the first postseason meeting in the history of the Cardinals–Cubs rivalry. The Cubs defeated the top-seeded Cardinals in four games to return to the NLCS for the first time since 2003.

John Lackey helped the Cardinals prevail in a shutout in Game 1. In Game 2, the Cubs jumped out to an early 6–1 lead and did not relinquish it, as the Cubs bullpen held the Cardinals' offense to just two more runs scored to even the series. Game 3 was an offensive duel which the Cubs won 8–6 in which Chicago hit six home runs. The Cubs then took Game 4 by a 6–4 score to win their first playoff series at Wrigley Field, and deny the Cardinals a fifth straight NLCS appearance.

New York won the series, 3–2.

This was the third postseason meeting between the Dodgers and Mets, having split the first two meetings (Dodgers won 4–3 in the 1988 NLCS; Mets won 3–0 in the 2006 NLDS). The Mets defeated the Dodgers in five games to advance to the NLCS for the first time since 2006.

Jacob deGrom had a solid pitching performance in Game 1 as the Mets won 3–1. The Dodgers rallied with a 4-run seventh inning to even the series headed to Queens. Game 3 was an offensive duel which the Mets won 13–7 to take a 2–1 series lead. The Dodgers evened the series in Game 4 thanks to a stellar pitching performance from Clayton Kershaw, and were now headed back to Los Angeles for a series-deciding Game 5. However, the Mets would narrowly prevail as deGrom and closer Jeurys Familia helped keep the Dodgers' offense at bay after the first inning.

Kansas City won the series, 4–2.

This was a rematch of the 1985 ALCS, which the Royals won in seven games after trailing 3–1 in the series. On the 30th anniversary of their previous postseason meeting, the Royals again defeated the Blue Jays, this time in six games, to advance to the World Series for the second year in a row.

In Kansas City, the Royals controlled the first two games - they prevailed in a 6–0 shutout in Game 1, and scored six runs again in Game 2 to go up 2–0 in the series headed to Toronto. Game 3 was an offensive duel which the Blue Jays won 11–8 to avoid a sweep. In Game 4, the Royals routed the Blue Jays in a 14–2 blowout to go up 3–1 in the series. While the Blue Jays blew out the Royals, 7–1, in Game 5 to send the series back to Kansas City, the Royals closed out the series with a 4–3 win in Game 6 to secure the pennant.

As of 2023, this is the last time the Royals won the AL pennant. The Blue Jays returned to the ALCS the next year, but fell to the Cleveland Indians in five games.

New York won the series, 4–0.

The Mets swept the Cubs to return to the World Series for the first time since 2000.

The Mets took Game 1 thanks to a solid pitching performance from Matt Harvey. In Game 2, Noah Syndergaard and the Mets' bullpen held the Cubs to just one run to take a 2–0 series lead headed to Chicago. In Game 3, the Cubs tied the game in the bottom of the fourth, however the Mets scored three unanswered runs in the sixth and seventh innings to win and take a 3–0 series lead. In Game 4, the Mets jumped out to a big lead early and did not relinquish it, clinching the pennant. This was the first NLCS which the team who swept the series did not trail in any of the games.

By coincidence, the Cubs' 2015 season ended on the same day as the 2015 World Series that was depicted in Back to the Future Part II. In the film, the Cubs swept a fictitious Miami team. However, the prediction in Back to the Future Part II was only off by one year, as the Cubs went on to win the 2016 World Series against the Cleveland Indians in seven games.

As of 2023, this is the last time the Mets won the NL pennant.

Kansas City won the series, 4–1.

This was the first World Series to feature two expansion teams - the Mets were the first expansion team to win the World Series overall in 1969, while the Royals became the first American League expansion team to win the World Series, doing so in 1985. The Royals defeated the Mets in five games to win their first World Series title since 1985.

In Game 1, the Mets held a 4–3 lead in the bottom of the ninth, however the Royals' Alex Gordon hit a solo home run to tie the game, handing New York's Jeurys Familia his first blown save in six postseason opportunities. Eric Hosmer won Game 1 for the Royals in the bottom of the fourteenth with a sacrifice fly. In Game 2, the Royals blew out the Mets thanks to a complete game performance from Johnny Cueto to go up 2–0 in the series headed to Queens. In Game 3, the Mets blew out the Royals by a 9–3 score thanks to a solid pitching performance by Noah Syndergaard to avoid a sweep. However, the Royals would take Game 4 by a 5–3 score to go up 3–1 in the series. In Game 5, New York's Matt Harvey helped keep the Royals' offense at bay and maintained a 2–0 lead for the Mets going into the bottom of the ninth. However, the Royals' Eric Hosmer cut the Mets lead to one with an RBI double which scored Lorenzo Cain, which prompted Mets manager Terry Collins to relive Harvey with Jeurys Familia. This decision proved to be fatal for the Mets, as Familia had yet another blown save as Hosmer stole home plate to tie the game. The game went scoreless throughout the tenth and eleventh innings, until the Royals broke the game open in the top of the twelfth, scoring five runs to take the lead for good, effectively securing the title. This was the second time in a row that the Mets lost the World Series at their home stadium (2000).

As of 2023, this is the last postseason appearance by the Royals franchise, as well as the last postseason appearance outside of the Wild Card round for the Mets. It is also the most recent World Series appearance for the Mets, and was the only World Series appearance by a team from New York City during the 2010s decade.