Yuki Matsui's 1.83 ERA in 2026 vs. a 5.1 walks-per-nine rate and 4.08 FIP
San Diego reliever Yuki Matsui has a 1.83 ERA and 2.23 WAR over 64 innings in 2026. His walk rate and FIP-style estimate suggest the ERA is better than his underlying level, and the answer compares him with league relievers and his own 2024-25 seasons.
Published: · Figures as of October 4, 2026
Asked: Is Yuki Matsui a good pitcher?
Matsui's 1.83 ERA is elite, but his walks say he's closer to a good reliever
Yuki Matsui has pitched like one of the better relievers in the league in 2026. He has a 1.83 ERA over 64 innings in 54 games for San Diego, with 5 wins, 1 loss, 1 save and 2.23 WAR. The league baseline here is 140 relievers with at least 50 innings, who average a 3.47 ERA and a 1.22 WHIP. Matsui's WHIP is 1.14.
The underlying numbers are weaker than the ERA. He walks 5.1 batters per nine innings, against a reliever average of 3.5. His strikeout rate is 9.6 per nine, a little above the 9.1 average. His FIP-style estimate, built from strikeouts, walks and home runs, is 4.08, against a reliever average of 3.56. Only 13 earned runs scored on 37 hits and 36 walks, so sequencing and stranded runners likely helped. FIP is an approximation here, since it uses a fixed constant.
His 2026 is a large jump from his own history:
| Season | Games | IP | ERA | WAR |
|---|---|---|---|---|
| 2024 | 64 | 62.2 | 3.73 | 0.78 |
| 2025 | 61 | 63.1 | 3.98 | 0.58 |
| 2026 | 54 | 64.0 | 1.83 | 2.23 |
His strikeouts barely changed (69, 61, 68), and his walks sit at 27, 33 and 36. The ERA drop came from fewer hits allowed, 37 this year against 46 and 53. The cut in home runs allowed was smaller, from 10 to 7.
DataBaller's Sustainability Score and Performance Shift have no read for him, so there is no model verdict on whether this holds.
Matsui is good this season by results. Over three seasons he looks like a solid strikeout reliever with a walk problem, and the 2026 ERA is probably better than his true level.
Confidence: Medium. The 2026 results are real, but the case for regression rests on one approximate FIP and a 64-inning sample; a lower walk rate or another year of sub-2.50 ERA would change this.