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The Baltimore Orioles and Kansas City Royals pulled off the unexpected with their respective sweeps of the Tigers and Angels in the American League Division Series.

Now, the two teams will square off in an ALCS that’s sure to keep fans on the edge of their seats.

The series begins at Camden Yards, with Game 1 scheduled for Friday at 8 p.m. ET on TBS.

Few pegged the Orioles as favorites in the AL East entering the season. But they wound up running away with the division, finishing with a 12-game lead over the second-placed New York Yankees, and made quick work of the Tigers in the ALDS.

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The field of four for the National and American League Championship Series has been set, with the Baltimore Orioles, Kansas City Royals, San Francisco Giants and St. Louis Cardinals, the underdogs from each League Division Series, moving on to the next round.

The aforementioned teams feature plenty of stars, whether it’s Adam Wainwright, Madison Bumgarner, Buster Posey, Alex Gordon or Adam Jones.

However, the eliminations of the Angels, Dodgers, Tigers and Nationals—arguably the favorites to win the World Series heading into October—means we’ll be forced to move forward without Mike Trout, Clayton Kershaw, Miguel Cabrera and Bryce Harper.

For some of those players, the fact that their team failed to reach the LCS falls on their shoulders.

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The Detroit Tigers’ once-promising season is over.

The Tigers’ roster seemingly was built for October baseball, with a starting rotation comprised of the Cy Young Award winners Max Scherzer, Justin Verlander and David Price as well as perennial All-Star hitters Miguel Cabrera, Victor Martinez and Ian Kinsler.

However, the AL Central champions ultimately came up short in their bid to return to the World Series, suffering a three-game sweep by the Baltimore Orioles in the ALDS.

To make matters worse, the Tigers’ early departure from the postseason means they’ll now have to face the reality that Scherzer’s impressive run with the organization might be over.

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FINAL SCORE: Nationals def. Giants, 4-1 (Giants lead series, 2-1)

The Washington Nationals will play at least one more game this season.

Facing Madison Bumgarner and the San Francisco Giants in a must-win Game 3 of the NLDS, the Nationals were able to push across four late runs en route to a 4-1 victory, forcing a Game 4.

Bumgarner was stellar through six innings, as he kept the Nationals off the board while piling up six strikeouts. The six scoreless frames pushed the 25-year-old left-hander's postseason scoreless innings streak to 22.

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The first week of the MLB postseason has had it all.

We’ve seen teams mount unimaginable comebacks late in games, whether it be the Kansas City Royals rallying to defeat the Oakland A’s in the AL Wild Card Game or the Baltimore Orioles getting to the Detroit Tigers bullpen for four runs in the bottom of the eighth inning in American League Division Series Game 2.

We’ve also seen some historical collapses, most notably Clayton Kershaw yielding seven earned runs to the St. Louis Cardinals during the seventh inning of National League Division Series Game 2. It certainly wasn’t what anyone was expecting for the soon-to-be three-time NL Cy Young Award winner.

In general, the first week of the postseason has been full of surprises. And based on how some of these series are playing out, it’s a safe bet there’s going to be even more in the coming weeks.

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The Detroit Tigers made a statement when they acquired David Price from the Tampa Bay Rays at the July 31 non-waiver trade deadline.

With a starting rotation that already featured a pair of Cy Young Award winners in Max Scherzer and Justin Verlander as well as Anibal Sanchez and Rick Porcello, adding Price gave the Tigers arguably the top staff in the American League—a unit built for the postseason.

"Simply put, Price makes the Tigers’ rotation the envy of the bulk of the baseball world," wrote Grantland's Jonah Keri in the wake of the trade. "While Detroit was going to make the postseason with or without Price, he’ll give them an undeniable edge in October."

Naturally, one would think that being traded to a playoff contender, let alone a preseason favorite to win the World Series such as the Tigers, would come with a tremendous amount of pressure.

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The Detroit Tigers' bullpen was their glaring weakness during the regular season, as late-inning collapses at times overshadowed their top-flight starting rotation and potent offense.

That trend carried over into Game 1 of the American League Division Series against the Baltimore Orioles. The Tigers bullpen coughed up eight runs in the eighth inning en route to a 12-3 loss in the opener.

The game was closer than the final score suggested. The Tigers trailed by just one run, 4-3, heading into the bottom of the eighth inning. And then the wheels fell off for Detroit.

Starter Max Scherzer recorded the first out of the inning before a double by Alejandro De Aza signaled the end of his night. Relieving the 2013 AL Cy Young Award winner was right-hander Joba Chamberlain, who promptly allowed two runs (one earned) without retiring a batter.

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Two of the Nationals League’s top teams will square off when the Washington Nationals take on the San Francisco Giants in the National League Division Series.

The series starts at Nationals Park, with Game 1 scheduled for Friday at 3:07 p.m. ET on Fox Sports 1.

The Nationals ran away with the NL East crown to make the postseason for the second time in the last three years, as the team won an NL-best 96 games while tying for the league’s best home record (51-30). Beyond that, the Nationals offense ranked fifth in the NL in batting average (.253) and slugging percentage (.393), and fourth in home runs (152) and OPS (.714).

The Giants, meanwhile, are coming off an impressive win in the NL Wild Card Game, as they defeated the Pirates 8-0 behind a four-hit shutout from Madison Bumgarner.

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After coming up short against the Boston Red Sox in the 2013 World Series, the St. Louis Cardinals entered the offseason with a very specific to-do list.

At the top of that list: adding a productive shortstop.

With the regular season in the books, it’s safe to say the Cardinals found what they were looking for in Jhonny Peralta.

The .222 batting average and four home runs from Cardinal shortstops in 2013 ranked 14th among all National League teams, while the duo of Pete Kozma and Daniel Descalso combined for a dismal minus-0.2 WAR.

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Two of the American League’s top teams will square off when the Los Angeles Angels take on the Kansas City Royals in the American League Division Series.

The series starts at Angel Stadium, with Game 1 scheduled for Thursday at 9 p.m. ET on TBS.

The Angels ran away with the AL West crown to make the postseason for the first time in the last four years, as the team won an MLB-leading 98 games while also posting the game's best home record (52-39). Beyond that, the Angels offense ranked third in the AL in batting average (.259), fourth in slugging (.406) and OPS (.728) and tied for fourth in home runs (155) with the White Sox and Tigers.

Meanwhile, the Royals are coming off a dramatic win in the AL Wild Card Game, as they defeated the A’s 9-8 in 12 innings in front of an electric crowd at Kauffman Stadium.