No matter your league’s settings for starting pitchers, you’re forced to make decisions about whether to start or bench pitchers each time their turn in the rotation comes up. If you’re in a league with an innings or games started cap, you have to try to maximize the limited opportunities you have to start a pitcher. If you play in a league with no such limitations, the natural friction between the counting categories and the ratio categories forces you to make similar decisions. Sure, you can start Jake Odorizzi and take advantage of the tenth best strikeout rate among qualified starters. But his 4.23 ERA and 1.31 WHIP count, too.
The number one factor I consider when making such a decision is who the pitcher is facing that day. The strength of the other team’s offense against pitchers of my starter’s handedness usually determines whether I start or bench a pitcher I’m on the fence about. Matchup is probably the biggest factor for most fantasy owners when it’s not a must-start pitcher. I asked Twitter where the cutoff is for must-start guys. I got answers ranging from only Felix and Kershaw all the way to the top 25-30 starters.
Top 30 was sort of the number I had in my head. I recently wrote a fantasy football piece in which I examined how matchups affected fantasy production for the top 25 wide receivers last year. I just tested the correlation between a player’s weekly production and the strength of the opposing defense measured by pass defense DVOA from Football Outsiders. Some interesting results came from that exercise, but one thing that wasn’t a surprise was the lack of correlation between production and matchup for the top receivers. To amass enough points to finish the season among the best, a receiver has to accumulate points each week regardless of the opponent. Likewise, I thought the top starting pitchers would be matchup proof with the correlation growing stronger as we moved away from the elite guys. Read the rest of this entry »