Jurrangelo Cijntje’s path has arrived at a simple but striking conclusion: the part of his game that made him famous may be the part holding him back.
The switch-pitcher the Mariners made a 15th overall pick in 2024 was always going to be one of baseball’s most unusual development projects. Cijntje had already done the rare thing at Mississippi State, and Seattle tried to build something even rarer - a pitcher who could get outs both as a power righthander and a crafty lefty.
That dream got tested in the minors, and then tested again after the Cardinals acquired him with outfielders Tai Peete and Colton Ledbetter for Brendan Donovan. Each time, the same trend kept showing up: he looked better when he stayed on one side.
Seattle’s first plan had him starting as a righthander and then working lefty-only relief outings in between. By May 2025, that idea was gone, replaced by a setup where he would face one to three batters left-handed per outing. The results with High-A Everett were uneven - a 4.58 ERA, 4.33 xFIP and 15.3% K-BB% over 74.2 innings - but the right-handed work kept flashing upside.
That split became even clearer once he reached Double-A. In two righty-only starts with Arkansas, he struck out 33.3% of batters and walked just 5.6% over 8.2 innings.
Overall, throwing right-handed in Double-A, he posted a 2.53 ERA with a 26.3% strikeout rate, 9.8% walk rate and .574 opponent OPS. The left-handed side of the ledger, meanwhile, never came close to matching it.
After the 2025 season, Seattle announced it would develop Cijntje as a righthanded-only pitcher. That arrangement didn’t last long before the trade to St.
Louis opened the door to switch-pitching again. The Cardinals gave it a look, and Cijntje opened 2026 at Double-A Springfield with a 5.04 ERA across 17 starts and 80.1 innings.
He struck out 28.2% of hitters, but he also walked 11.3% and surrendered homers at a high clip. Against lefthanders in Double-A, he walked 29% and hit two.
Right-handed hitters had a much tougher time, as his righthanded numbers stayed far stronger.
The move to Triple-A Memphis after the all-star break didn’t start cleanly. In his first four starts, Cijntje allowed 16 earned runs in 18 innings, with 16 walks and 21 strikeouts.
He was still alternating throwing hands, but the lefty work produced little more than free passes. At that point, St.
Louis finally cut bait on the experiment and committed to him as a righthanded starter.
That decision changed everything.
Over the final six weeks, Cijntje was one of the hottest pitchers in the International League. His first righthanded-only start came with 11 strikeouts, a 96.3 mph average fastball and a top reading of 97.9. The broad split tells the story:
Before, from July 19 to Aug. 6, when he faced only righthanded batters: 81 batters, 24.7% strikeout rate, 18.5% walk rate.
After Aug. 13: 143 batters, 28.7% strikeout rate, 7.7% walk rate.
The underlying stuff backed it up, too. Over his final seven starts, Cijntje leaned on five pitches - four-seam fastball, sinker, slider, sweeper and changeup - and the mix sharpened as he stopped switching.
His changeup usage climbed to 15% during that stretch. Four of the five pitches held hitters to a .280 xwOBA on contact or lower, while his fastball zone rate jumped to 65% with a 30.5% CSW%.
Pitch by pitch, the weapons were real. The four-seamer sat 96.4 mph and touched 99.1.
The slider and sweeper both missed bats and added positive run value, while the changeup showed enough whiffs and chases to hint at more if he can land it in the zone more often. It still needs better vertical separation from the fastball, but the shape of it is encouraging.
The sinker, meanwhile, gave him another firm look at 94.5 mph.
The larger sample makes the argument even more plainly. In starts where Cijntje didn’t throw left-handed, he has been the better pitcher.
Across 13 starts, he has a 3.90 ERA, 28.1% strikeout rate and 8.0% walk rate. In 38 starts with lefty pitching involved, those numbers slide to a 4.27 ERA and an 11.8% walk rate.
Even when narrowed to right-handed batters only, the version with lefty usage still lags behind the no-lefty version.
The same pattern shows up by level, too. In 2025 Double-A starts without lefty pitching, he posted a 2.08 ERA and a 33.3% strikeout rate. In 2026 Double-A starts without lefty pitching, the numbers were rougher, but at Triple-A after Aug. 6 he settled in again with a 2.86 ERA, 28.9% strikeout rate and 7.7% walk rate over seven starts.
That’s why the final stretch matters so much. If those last seven starts are the real indicator, then the Cardinals may have found a major trade win. Cijntje led the minor leagues in strikeouts in 2026, and the version of him that stays on the righthanded side may be the one with the cleanest path forward in 2027.
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