FanGraphs Power Rankings: September 11–17
The Wild Card races in both leagues continue to be filled with drama as none of the teams vying for those playoff spots have created any daylight in the standings.
A quick aside before we get into the rankings themselves: there has been some discussion about the efficacy and value of these rankings, particularly the team quality metric I’m calculating. I won’t argue that it’s a perfect encapsulation of any given team’s relative strength or the right way to rank teams on a weekly basis, but I did want to share some historical data from last season. In 2022, team quality had a 97% correlation to a team’s final win percentage. In addition, team quality at the All-Star break had a 95% correlation to a team’s final record. The relationship hasn’t been as strong this season with team quality at the All-Star break having a 82% correlation to a team’s current record. It’s possible teams like the Orioles and Padres who are historically over- or under-performing their underlying stats are skewing the relationship and that’s a possible area of research this offseason. Anyway, I’m comfortable with the established relationship between team quality and actual wins to continue using it as a way to compare team strengths.
A reminder for how these rankings are calculated: first, we take the three most important components of a team — their offense (wRC+), their pitching (a 50/50 blend of FIP- and RA9-, weighted by starter and reliever IP share), and their defense (RAA) — and combine them to create an overall team quality metric. I also add in a factor for “luck,” adjusting a team’s win percentage based on expected win-loss record. The result is a power ranking, which is then presented in tiers below.
Team | Record | “Luck” | wRC+ | SP- | RP- | RAA | Team Quality | Playoff Odds |
---|---|---|---|---|---|---|---|---|
Braves | 96-53 | 2 | 125 | 93 | 91 | -7 | 156 | 100.0% |
Rays | 92-59 | -3 | 117 | 89 | 93 | 6 | 164 | 100.0% |
With the NL East and a first-round bye into the playoffs locked up, the Braves are simply hoping to get to October with a healthy roster that hasn’t lost its edge. That’s why it’s important to not get too worked up about any extreme swings in results over these last few weeks of the season. Case in point: Atlanta took three of four from the Phillies in a potential NLDS preview early last week before allowing 36 runs across three games in a sweep by the Marlins over the weekend.
The Rays had an opportunity to take over the AL East lead after taking the first two games of their big weekend series against the Orioles. The two best teams in the AL ended up splitting that four game-series and head into this week locked into the same position, with Tampa Bay sitting two games behind Baltimore. One of the biggest reasons why the Rays have been able to keep pace in the division is a much improved bullpen locking down games behind a suddenly stable starting rotation. Read the rest of this entry »