"Fantasy Playoff Matchups: Who to Target, Who to Trade Away"

"Every team's September playoff slate graded by the matchups that matter: the pitching your bats will face, the offenses your arms will face, the parks, and the platoon splits. The pickups, trade targets, and fades the numbers point to."

Your fantasy playoffs are three weeks in September. The players who win them are not always the best players. They are the players with the best matchups: bats facing bad pitching in good parks, arms facing weak lineups, and hitters holding the platoon advantage all month. That is knowable today, so we pulled the full MLB schedule for September 7 through 27 and graded every team's slate the way a matchup actually works. For hitters, the park-adjusted runs allowed per game of the pitching staffs they will face. For pitchers, the park-adjusted runs scored per game of the lineups they will face. Then games played, and lefty-righty exposure on top.

Most leagues run quarterfinals the week of September 7, semifinals the week of September 14, and the championship the week of September 21. If your league shifts a week earlier, the rankings barely move; the same series drive them.

The matchups your bats will face

League average is 4.48 runs allowed per game. These are the staffs and parks each team's hitters draw across the three playoff weeks, park-adjusted.

Juiciest for hitters: Seattle (5.05), Detroit (4.93), Cleveland (4.85), Toronto (4.80), Arizona and San Diego (4.79), the Yankees (4.76). Mariners bats face pitching that bleeds more than half a run per game above league average, the best hitting matchups in baseball. Arizona and San Diego both ride Coors trips, which we will get to.

Ugliest for hitters: Cincinnati (4.02), the Cubs (4.06), Texas (4.12), San Francisco (4.14), Miami (4.15). Reds bats face the best pitching in the league in September, nearly half a run per game below average.

The matchups your arms will face

Same idea, reversed. League average offense scores about 4.5 park-adjusted runs per game.

Softest lineups faced: Texas arms draw offenses scoring just 4.04 park-adjusted runs per game, the best pitching matchups in the league, helped by the most pitcher-friendly parks in September. Then the Dodgers (4.17), Red Sox (4.24), Twins (4.26), and Mariners (4.27).

Toughest lineups faced: Cincinnati again (4.86), Philadelphia (4.84), and, quietly, Detroit (4.77). That last one matters: Tigers bats have the second-best matchups in baseball, but Tigers arms face top-three toughest lineups. Same jersey, opposite plays.

Games played: the quiet edge

Thirteen teams play 19 games across the three playoff weeks. Washington plays 17. Over three weeks that is a full series of extra at-bats and two extra starts, and it costs nothing to be on the right side of it.

The 19-game teams: White Sox, Twins, Dodgers, Tigers, Angels, Padres, Yankees, Mets, Rockies, Rays, Braves, Phillies, Reds.

Championship week is where the calendar gets loud. The Yankees play seven games the week of September 21, all at home, four against the Rays and three against the Orioles. The Rays also play seven that week, but all on the road at Yankee Stadium and Philadelphia. If you reach your final, a Yankee bat gets you seven home games in a short-porch park while most rosters get six.

Ballpark factors: where the games actually happen

We weighted every team's September slate by the run factor of the park each game is played in, using the same park model that powers the StreamMachine, then did it again for home runs by batter handedness.

Best run environments: Colorado (1.077, with ten home games at Coors), the Athletics (1.071), Arizona (1.035), Philadelphia (1.033), and Houston (1.023).

Worst: Texas (0.941), San Francisco and the Cubs (0.963), St. Louis (0.964). Note what that does for Rangers pitchers: the softest lineups faced, in the most run-suppressing parks. It cuts both ways for their bats.

Three Coors notes worth planning around, because visitors get the altitude too. San Diego plays four games at Coors in semifinal week. Seattle plays three there the same week, stacked on top of the best hitting matchups in the league. And Arizona gets three at Coors in championship week.

The handedness splits add one more layer. The Dodgers' September parks carry a 1.095 home run factor for right-handed batters, the highest in the league, which lands squarely on Andy Pages, Mookie Betts, and Teoscar Hernandez. Philadelphia's slate plays at 1.070 for lefty power. San Francisco's plays at 0.896 for lefty power, the worst number on the board, and it belongs to Rafael Devers.

Lefty-righty: who actually sees southpaws

We measured each opponent's share of starts made by left-handers this season, then summed it across every September matchup. The result is the number of lefty starts each team should expect to face in the three playoff weeks.

Most lefties faced: Tampa Bay (7.6 expected lefty starts), Cleveland (6.9), Minnesota (6.5), Boston (6.1), Cincinnati (6.1). Tampa Bay's week two alone runs through Boston, whose rotation is 75 percent left-handed.

Fewest lefties faced: the Athletics (3.7), Dodgers (4.5), Giants (4.6), Diamondbacks (4.6). Houston, Seattle, and Miami rotations are almost entirely right-handed, so teams that draw them in September see nothing but righties.

The play here is simple. Right-handed bats on teams facing lots of lefties gain hidden value. Left-handed bats on those same teams lose starts to platoons. And left-handed bats on the low-exposure teams are close to platoon-proof for the whole run.

Teams to fade

Putting the layers together, these are the slates to sell into, whatever the name on the jersey.

Reds. The worst matchups in baseball on both sides of the ball: their bats face the league's best pitching and their arms face the league's best lineups. Nineteen games of volume cannot rescue that. Great American Ball Park inflates homers, so the power plays, but everything else fights uphill.

Nationals. Seventeen games, fewest in the league, with below-average matchups everywhere. There is no angle here.

Cubs. The second-worst hitting matchups in the league, in a 0.963 run environment. This is the fade that costs the most to act on, because the names are good. The matchups do not care.

Giants. Bottom-five hitting matchups, a 0.963 run environment, and the league's worst lefty power parks.

Rangers bats, specifically. Bottom-three hitting matchups in the league's worst September parks. Their arms are a different story below.

Marlins. Bottom-five hitting matchups in a slight pitcher's environment, with no games-played edge to offset it.

Red Sox power, softer fade. Their parks suppress home runs from both sides at roughly 0.937, and their bats face one of the heavier lefty loads. Their arms, though, draw top-three soft lineups.

Pickups: waiver-tier players the matchups promote

These players sit outside the top 150 on the rest-of-season consensus, which means they are available or nearly free in most leagues.

Taylor Ward, Mariners. The best hitting matchups in baseball at 5.05 park-adjusted runs allowed per game, plus three games at Coors in semifinal week. A right-handed power bat in the single best spot the schedule offers. If he is on your wire, this is the add.

Dillon Dingler and Gleyber Torres, Tigers. Detroit bats hold the second-best matchups in the league at 4.93, with twelve September home games. Catcher and second base are exactly where you want matchup help, because the alternatives are worse.

Royce Lewis, Ryan Jeffers, and Luke Keaschall, Twins. Honesty first: the pitching Minnesota faces is roughly league average. The case is volume and platoon, and it is strong: 19 games, the third most lefty starters faced in the league, and every one of these bats hits right-handed. In weekly head-to-head, plate appearances against southpaws are the edge.

Sean Burke and Davis Martin, White Sox arms. Chicago arms draw soft lineups at 4.38 in slightly pitcher-friendly parks, and the team plays 19 games, so two-start weeks are likely. This is how playoff pitching weeks get won without a trade.

Trent Grisham, Yankees. The championship-week specialist: seven games, all in the Bronx, against top-seven hitting matchups. If your final is week three, he is a free outfielder built for it.

Trade targets: pay for the matchups, not the name

Julio Rodriguez, Mariners, and it is not close. The best hitting matchups in baseball, a Coors series in semifinal week, and almost no lefty exposure to dilute anyone around him. The whole Seattle offense is in play, and Seattle's arms draw soft lineups too: Logan Gilbert, Bryan Woo, George Kirby, and Bryce Miller all benefit twice.

Riley Greene, Tigers. Second-best hitting matchups in the league, twelve home games, and Detroit's light lefty exposure protects his left-handed swing. Do not pay for Tigers pitching, though; their arms face top-three tough lineups.

Junior Caminero and Yandy Diaz, Rays. The platoon play of the month. Tampa Bay faces more left-handed starters than anyone, both hit from the right side, and the Rays play a seven-game championship week with four at Yankee Stadium. The staffs they face are ordinary; the handedness and the calendar are not.

Ben Rice and Jazz Chisholm Jr., Yankees. Top-seven hitting matchups, thirteen of nineteen at home, and a seven-game home championship week. Both swings are built for that porch.

Joe Ryan, Twins. Minnesota arms draw the fourth-softest lineups in the league at 4.26, and 19 games means two-start weeks. The cleanest ace matchup profile of the playoff window.

Nick Kurtz and Tyler Soderstrom, Athletics. Above-average hitting matchups, the second-best run environment in baseball at 1.071, twelve of eighteen at home, and the fewest lefty starters faced in the league. Two left-handed bats who will almost never sit, in parks that help them.

Rangers arms, whoever you can get. The softest lineups faced in the league at 4.04, in the most pitcher-friendly parks. The quietest streaming well of September.

Trade away: sell the name, dodge the matchups

None of these players got worse. Their September did.

Elly De La Cruz, Reds. The worst hitting matchups in baseball, against the best pitching the schedule serves anyone, with his team's arms simultaneously facing the best lineups. He is exactly the profile whose trade return will never be higher than it is in August, and whose September never justifies it.

James Wood and CJ Abrams, Nationals. Seventeen games, fewest in the league. Two fewer games is roughly eight plate appearances per bat in the weeks that decide your season.

Pete Crow-Armstrong, Cubs. Second-worst hitting matchups in the league, a suppressive environment, and a left-handed swing facing an above-average lefty load. The talent is real; the three weeks are not his.

Rafael Devers, Giants. Bottom-five hitting matchups in a 0.963 run environment, and he specifically hits into the league's worst lefty power parks at 0.896. Logan Webb is closer to neutral; if a contender values the name, September is the argument for taking the deal.

Otto Lopez and Xavier Edwards, Marlins. Bottom-five hitting matchups with no volume edge to offset them.

The platoon-risk Rays: Jonathan Aranda, Chandler Simpson, and Liam Hicks. The same lefty parade that makes Caminero a monster puts these left-handed bats on the bench. If you roster Simpson for steals, know that the week you need him most may be the week he sits.

The one-paragraph version

Buy everything Mariner, Tigers bats but not Tigers arms, Rays righties, Yankees lefties, Athletics lefties, and Joe Ryan. Stream White Sox and Rangers arms freely. Circle San Diego's four games at Coors in semifinal week and Arizona's three in championship week. Sell into the Reds, Nationals, Cubs, Giants, and Marlins matchups while the names still carry August prices, and check whether your left-handed bats play for teams about to face a month of southpaws. The player pool does not change in September. The matchups do.

Matchup grades are the park-adjusted runs allowed per game of the staffs each team's hitters face and the park-adjusted runs scored per game of the lineups each team's pitchers face, computed from the full MLB schedule for September 7 through 27, this season's team run totals, and the park factor model behind the StreamMachine. Lefty exposure uses each opponent's actual share of starts by left-handers. Player ranks reference the FanRanked rest-of-season consensus.