Spring training: when the sunlight is bright and falls upon certain players more than others. A new pitch, a new swing, or a fresh face can all capture the attention of fans and writers alike eager to emerge from the cold tyranny of a baseball-less winter.
At Blue Jays spring training in 2022, Yosver Zulueta was that sensation, the buzziest pitching prospect that spring thanks to his big fastball and mysterious origins, having missed the first part of his career with a devastating back-to-back slate
of injuries: first, Tommy John and then immediately after that recovery, an ACL tear. But his big fastball captivated crowds, especially on a Blue Jays staff of underwhelming velocity; MLB.com Blue Jays reporter Keegan Matheson described clusters of fellow pitchers gathering to watch his bullpens, the deepest sign of respect for a fellow pitcher.
But spring training attention burns hot and fast. Zulueta, having missed such a significant chunk of developmental time, went to the low minors as a 24-year-old. Toronto promoted him aggressively up the minor-league ladder in 2022, jumping him from A ball clear up to Triple-A, but his command just never kept pace. He spent 2023 struck at Triple-A, never getting the call up for a Blue Jays bullpen that was one of the stronger units in baseball. A move to Cincinnati didn’t aid his command woes.
The Mariners will be the next team to try to help Zulueta (zoo-loo-etta) rein in the immense potential in his right arm. For all the talk about his big fastball, it’s the slider that has been more of a whiff-getter in the upper levels. It moves like a curveball, which Zulueta also throws, with some very late glove-side break that’s especially tough on righties.
With lefties, there’s a little bit of risk that slider can get right into the lefty loop zone. That puts a little more pressure on Zulueta’s sinker, which comes in around 96-97 but not always where he wants it to go.
If all this is giving you big time Carlos Vargas flashbacks, you’re not wrong. Vargas, also with primarily a sinker-slider arsenal, was a similarly stuff-y prospect the Mariners picked up in the Eugenio Suárez salary dump trade with Arizona, dazzling with high-velocity potential but very little sense of the strike zone. Like Zulueta, Vargas came with an option, and the Mariners banished him to work on his command in Triple-A Tacoma before giving him a longer look this season.
As Ryan pointed out in his 40 in 40 on Vargas this year, though, Vargas’s great stuff on paper has so far not translated to consistent success in the big leagues. But there is a key difference between the two. Vargas’s strikeout rate tanked in Triple-A with Arizona, and didn’t improve after a move to Seattle, even if his walk rate did calm down. Zulueta has reliably struck out 25-30% of hitters over his career. If the Mariners can successfully put him in The Machine and get him in the zone more, the upside to Zulueta is significant. And because of the delayed start to his career, Zulueta, despite being 27, still has a minor-league option.
And all of this hasn’t looked at the thing that brought Zulueta to the Blue Jays’ attention in the first place as an international free agent out of Cuba: his 98 mph four-seamer. The problem with the pitch is despite its plus velocity, it has meh characteristics: an IVB of under 10” and a horizontal break of under 13”, meaning it’s a fairly straight fastball. The sinker has less velo but more of a wrinkle in movement, which is why it’s his primary fastball, but the big four-seamer is certainly a pitch to dream on.
Zulueta will have another chance for a moment in the sun this spring. The Mariners preach being in the zone fervently, with pitch decks that present the statistics of being in advantage counts alongside testimonials from current players. How quickly Zulueta adapts to his new environment will play a key role in how much the sun shines on him this spring.
