Kenley Jansen’s Eastward Migration Continues, This Time to Boston

For more than a decade, Kenley Jansen has been a part of the fabric of baseball. He’s spent most of that time with the Dodgers, logging a dozen seasons as the reliever whose late-inning fortune sent Los Angeles fans into agony or ecstasy. Last year, he decamped for Atlanta, and this year his travels will continue: as Jeff Passan first reported, he’s shipping up to Boston on a two-year, $32 million deal.
At 35, Jansen is headed into the tail end of his career, though he’s still got plenty in the tank. Over the past five years, he’s declined from one of the best few relievers in the game – he posted a 2.01 ERA from 2013-17 – to merely an effective bullpen arm, with an aggregate 3.08 ERA and the peripherals to match. That’s a relatively graceful downward path, though it hasn’t always felt that way. Dodgers fans alternated between bringing out pitchforks and convincing themselves that Jansen was returning to his earlier dominance over four of those years, and he was unsteady at times in Atlanta, though he put together a solid season on the whole.
His pitch mix has likewise changed with age. Early in his career, “mix” might even have been a misnomer, because it implies a minimum of two things. From 2010-18, 87% of his pitches were cutters. That’s more of a pitch monoculture, or a pitch manufactured subdivision; every house identical, every plant eerily perfect. Read the rest of this entry »