Postseason Preview: Astros and White Sox Set to Battle in ALDS
Both the Astros and White Sox dominated their respective divisions in 2021. For Houston, this was the team’s fourth division title in five years; for Chicago, its first since 2008. With the Rays having run away with the AL’s best record, these two clubs have been in each other’s sights for a while now. Both teams are filled with offensive stars, hard-throwing pitchers, and deep rosters; on paper, this looks like an even matchup.
The Astros are vying for their fifth consecutive trip to the American League Championship Series, which they’ve won twice, first in 2017 and again in ’19. They backed into the expanded playoffs last year as the only AL team with a record below .500 but came alive in the playoffs and nearly completed an 0–3 series comeback against Tampa before falling in Game 7. As for the White Sox, they’ve now made the playoffs in consecutive seasons for the first time in their franchise history — appearances that are the culmination of a long rebuilding cycle that began more than half a decade ago. And this series will be a rematch of the 2005 World Series, Chicago’s last title and back when Houston was still a National League club.
| Overview | White Sox | Astros | Edge |
|---|---|---|---|
| Batting (wRC+) | 109 (3rd in AL) | 116 (1st in AL) | Astros |
| Fielding (OAA) | -5 (9th) | 41 (1st) | Astros |
| Starting Pitching (FIP-) | 85 (1st) | 96 (6th) | White Sox |
| Bullpen (FIP-) | 85 (1st) | 99 (9th) | White Sox |
For the third time in the last five years, the Astros led the majors in wRC+ and also finished first in runs scored, batting average, on-base percentage, and strikeout rate. That last statistic is perhaps most important to their playoff success. As previous research has shown, high-contact teams do well against high-velocity pitchers, which every postseason team has in spades. A team’s regular-season strikeout rate also tends to correlate well with postseason success, as Eno Sarris found over at The Athletic. That tracks with the foundation of the Astros’ success over the last half-decade.
| Year | Astros K% | League K% | Astros wRC+ |
|---|---|---|---|
| 2015 | 22.8% | 19.9% | 109 |
| 2016 | 23.4% | 20.6% | 102 |
| 2017 | 17.2% | 21.2% | 122 |
| 2018 | 19.2% | 21.7% | 110 |
| 2019 | 18.1% | 22.4% | 125 |
| 2020 | 19.7% | 23.4% | 98 |
| 2021 | 19.3% | 22.6% | 117 |
