Peter Dizikes of the MIT News Office highlights one of the finalists in the MIT Sloan Sports Analytics Conference, currently being held in Boston. The paper, “A Data-driven Method for In-game Decision Making in MLB”, was developed by John Guttag and Ganeshapillai Gartheeban.
Guttag and Gartheeban’s developed a model that suggested when managers should take their starting pitchers out of the game by using data from the first 80 percent of the 2006-10 seasons to develop a model. Then they tested their model against the results in the final 20 percent of the season.
Dizikes summarizes some of the important findings:
The study finds that from the fifth inning on, in close games, pitchers who were left in games when the model recommended replacing them allowed runs 60 percent of the time, compared to 43 percent of the time overall.
Over 21,538 innings, the Guttag-Gartheeban model disagreed with the manager’s decision regarding his starting pitcher 48 percent of the time. About 43 percent of the time, the manager left the starting pitcher in when the model indicated he should be replaced. In just 5 percent of the cases did managers pull starting pitchers when the model suggested they should stay in the game
Guttag and Gartheeban do note that their methodology doesn’t consider every factor and recognize that the manager is considering a lot more than just the current game situation. Hypothetically, leaving Justin Verlander in with a 110 pitch count in a 2-1 game in the bottom of the eighth in late September when the Tigers are only in the lead by a game could be justifiable when most objective models would suggest taking him out.
That being said, many managers can improve simply by not having their pitchers throw unnecessary innings, like the seventh inning after their team has taken a 10-1 lead.
Facing an elimination number of one, the Astros staved off elimination in the AL West by beating the Diamondbacks on Friday night by a 6-1 margin. The Rangers suffered a heartbreaking loss to the Angels on Saturday afternoon, which temporarily put the Astros’ fate in their own hands.
Colby Rasmus hit a pair of solo homers and Jose Altuve added a solo shot of his own. Starter Collin McHugh tossed seven innings of one-run ball, limiting the Diamondbacks to six hits and a walk with six strikeouts. Reliever Will Harris allowed a solo home run to Paul Goldschmidt in the eighth, but Luke Gregerson closed out the game with a scoreless ninth.
The Astros trail the Rangers by one game in the AL West and lead the Angels by one game for the second AL Wild Card slot. The Rangers can clinch the AL West on Sunday afternoon with a win or an Astros loss. The Astros can clinch the second AL Wild Card on Sunday afternoon with a win or an Angels loss.
The Yankees lost both ends of Saturday’s doubleheader against the Orioles and lead the Astros by only one game for the first AL Wild Card slot.
If the Astros win and the Rangers lose on Sunday, they will play an AL West tiebreaker in Texas. The winner will win the second AL Wild Card if the Yankees win on Sunday, or the first AL Wild Card if the Yankees lose on Sunday.
If the Astros lose and the Angels win on Sunday, the two teams will be tied for the second AL Wild Card. They would play a tiebreaker in Houston, and the winner would play the Yankees in New York in the Wild Card game.
Giants second baseman Kelby Tomlinson looked more like Ladainian Tomlinson the way he was running during Saturday afternoon’s game against the Rockies. In the first inning with one out against starter Chris Rusin, Tomlinson hit a fly ball into the right-center field gap at AT&T Park, a great place to go if you’re in the mood for an inside-the-park home run.
Neither Carlos Gonzalez nor Chris Dickerson could corral the ball before it rolled all the way to the 421-foot marker at the fence. Tomlinson motored around the bases, but Gonzalez made a strong throw into cut-off man D.J. LeMahieu, and LeMahieu made a great throw in to catcher Tom Murphy, but Tomlinson slid in safely just ahead of the tag.
It was an exciting play and the hit proved important as the Giants eked out a 3-2 win against the Rockies.