The New York Yankees were far and away the busiest team at the August 1st trade deadline, and their decision to “sell” surprised many. As detailed here by MLBTradeRumors, the Yankees traded away 4 active players and a prospect, and received back 10 prospects, 2 major leaguers, and 2 players-to-be-named-later (PTBNL). While the Bronx Bombers are only 5.5 games back of the second wild card spot as of August 3, their decision to sell off aging players and retool for the future is a tried and true strategy that they hope will pay off.
Earlier this week, Casey Boguslaw posted an excellent article over at Baseball Essential regarding Lineup Optimization. The premise of his argument revolved around comparing a team’s wRC+ and their run production per game. In theory, a team with a low wRC+ but high R/G implies that the lineup has been optimized, i.e. they are squeezing every run out of which they are capable out of the lineup. Conversely, a team with a high wRC+ but low run production is suboptimal, and not scoring as much as they should.
Let’s apply this concept to bullpen use. Each team has a certain number of relievers they are able to use in different situations. Similar to the lineup, different points in the game are more or less crucial. This is tracked by the leverage index (pLi). In a few words, a game situation of average leverage has a pLi of 1, with more intense game situations greater than 1, while less intense situations are less than 1. For a bullpen to be optimized, as the leverage increases incrementally, better and better relievers must be used, i.e. the relationship is roughly linear.