Cardinals Strengthen Bullpen Without Paying Top Dollar
As the going rate for elite relievers continues to make grown men and women blush, it’s increasingly evident that there’s value in not needing to get into the market for the crème de la crème of relievers. Through the hefty prices paid in the acquisitions of Craig Kimbrel, Ken Giles, Aroldis Chapman and, now, Andrew Miller, contending teams are making it clear that they value having that lights out guy at the back of the bullpen perhaps even more than we may have once thought. Fortunately for the St. Louis Cardinals, when they lost their closer, Trevor Rosenthal, first to under-performance and then (perhaps not coincidentally) to a rotator cuff injury, they had an internal alternative which kept them from needing to wade into the deep end of the relief pitching market.
Seung Hwan Oh has been absolutely dominant for the Cardinals this season first as a set-up man and, for the last month, as a closer. The 34-year-old right-hander who had been tremendously successful in both South Korea and Japan has posted a 1.69 ERA and a 26.4 K-BB% since being signed by St. Louis this past winter. His 1.94 FIP ranks tenth among relievers in baseball this season. With the loss of Rosenthal, the Cardinals could have pursued the top names on the relief market this month, but Oh gave them the freedom not to. Instead, they made a relatively quiet transaction this morning picking up left-handed reliever Zach Duke from the Chicago White Sox in exchange for 23-year-old outfield prospect Charlie Tilson — a deal which was announced in true old-school fashion by the teams themselves.
In 2014, Zach Duke posted a surprisingly strong season out of the bullpen for the Brewers. He was 31 at the time and it was his first full season in a major league bullpen after scuffling along as an under-performing starter for most of his 20s. That one great season led to the White Sox giving him a 3-yr/$15M which was heavily mocked at the time due to his age and lack of a successful track record. It would appear, however, that the White Sox were either on to something or extraordinarily lucky as Duke has continued to be a solid reliever since signing the contract.
Since the start of the 2014 season, he has thrown 157 innings to very impressive results: 2.87 ERA, 27.9 K%, 58.2 GB%. He walks more batters than you might like — 10.0% walk-rate — but it’s hard to complain when the overall results are as strong as his. The key to his success has been a curveball which misses bats — the whiff-rate on his curve this season is 43.9% which ranks 12th of 41 MLB relievers (min. 100 curves) — and a sinker which induces grounders on 67% of balls in play. This has resulted in him posting an impressive combination of strikeouts and grounders over the past three seasons.