Steven Jaschinski
15 games graded behind the plate.
2,006 correct of 2,148 graded takes (93.4% ± 1.1, 95%). Best game 96.9% · worst 88.7%. Grade is accuracy on taken pitches vs the rulebook zone; ABS is the Automated Ball-Strike System challenge record (how often the robots overruled the call).
What we can't say about Steven Jaschinski
This season is 2,148 graded takes, which puts Steven Jaschinski's overall accuracy at 93.4% ± 1.1 (95% interval). That interval is a large share of the whole league's four-point spread, so this grade is a reading and not yet a ranking — we print it, and we do not place it against umpires with a full season behind the plate. Everything finer is further out of reach still:
- how the zone moves with two strikes — about 430 takes, so ±2.3 points. (the league-wide two-strike effect is about 1 point in 2026.)
- any single corner of the zone — about 179 takes, so ±3.6 points. (corner cells are where umpires actually differ.)
- whether one pitcher is called tighter than another — about 36 takes, so ±8.1 points. (a given pitcher is worked once or twice a season.)
And a note on the number itself: an accuracy figure is a rate plus a convention for what counts as a miss. Ours grades every taken pitch against the rulebook zone as the feed reports it. Others are more forgiving — UmpScorecards counts a call wrong only when the pitch was at least 90% likely to be a strike — so two sites can print the same percentage about the same umpire and not mean the same thing by it. How the grade is built.
The overturn rate is a different kind of number and does not belong beside the grade: it is accuracy on the 64 pitches players chose to challenge, which are the pitches they already believed were wrong. 64 is enough to print it with its own denominator, which is what we do — but it still ranks umpires by how often they are appealed, not by how often they are right.
The road to the plate
The Clinic and the Climb
A Canadian umpire who started at nine, climbed through six leagues, and now gives back to the community he had to leave to find.
From Burlington
Steven Jaschinski organized a two-day umpiring clinic in Canada that brought together five of the country's seven professional umpires for classroom and on-field instruction. He said the initiative was his way of giving back and growing the umpiring community in Canada, because he had to travel to the United States as a kid to learn from professionals.
The road started early. He was umpiring amateur baseball at age nine in Burlington, Ontario, and eventually attended the Minor League Baseball umpiring camp in Vero Beach, Florida, where he ranked in the top 25. From there he was placed in the Gulf Coast League and moved through the single-A Northwest League and Midwest League. He came up through Canada's Intercounty Baseball League and began the 2025 season in the triple-A International League before his call-up.
In 2025, he debuted as the second-base umpire in the Toronto Blue Jays' 5-4 loss to the Detroit Tigers at Rogers Centre — the third Canadian to umpire in the big leagues that season, joining Stu Scheurwater and Alex Tosi. A year earlier, he and fellow former IBL umpire Chris Marco had been selected to work MLB Spring Training games, a step toward rover status and the regular-season assignments that follow. In 2026, he issued his first career MLB ejection to Blue Jays manager John Schneider.
We have graded Jaschinski behind the plate in 10 games this season, and the record on this page is the reason his name is here.
Reporting: Cambridge Times, Canadian Baseball Network, Cooperstowners in Canada, Baseball Almanac. Umpire data: MLB StatsAPI, via the Fever engine.
By the Desk · filed 2026-07-24 — the profile reads as of its filing; the grading record above is live · every fact in this piece comes from a sourced research pack and clears an independent fact-check, and nothing is edited after filing.
The games
| Game | Grade | Favor | ABS | Blue Note |
|---|---|---|---|---|
| SEA @ TOR2026-08-30 | B | 0.4 TOR | 0/2 | Down the middle. Both dugouts had the same zone. |
| HOU @ NYY2026-08-26 | B | 0.2 HOU | 3/5 | The kind of night where the umpire is the least of the story. |
| SF @ CLE2026-08-20 | B | 0.4 CLE | 0/4 | Expanded the plate a touch past its 17 inches. |
| HOU @ SF2026-08-11 | B+ | 0.6 HOU | 1/5 | Solid and unspectacular — exactly what the job asks. |
| MIL @ LAA2026-08-02 | A | 0.4 LAA | 0/4 | Reliable as a Tuesday: no complaints, no headlines. |
| COL @ LAD2026-07-08 | B | 1.1 LAD | 1/4 | Two dugouts, and only one of them smiling. |
| BOS @ LAA2026-07-04 | B+ | 0.5 LAA | 2/4 | The kind of night where the umpire is the least of the story. |
| LAD @ ATH2026-06-30 | D | 0.5 LAD | 2/3 | Pitchers found a little extra real estate. |
| BOS @ SEA2026-06-19 | A | 0.5 BOS | 4/5 | Solid and unspectacular — exactly what the job asks. |
| NYY @ TOR2026-06-14 | A | 0.5 NYY | 2/5 | The zone kept its promises. |
| ATH @ CHC2026-06-04 | A | 1.0 ATH | 2/3 | The corners were friendlier in one direction tonight. |
| PHI @ LAD2026-05-29 | B | 0.3 LAD | 1/3 | The black wasn't in play tonight. |
| SF @ ATH2026-05-17 | B+ | 0.5 SF | 2/5 | The zone kept its promises. |
| TB @ BOS2026-05-08 | B | 0.0 TB | 2/5 | Down the middle. Both dugouts had the same zone. |
| DET @ MIN2026-04-08 | C+ | 0.7 DET | 4/7 | The black wasn't in play tonight. |