Aaron Ashby has thrown 13.0 scoreless innings this postseason — ERA 0.00, WHIP 0.55 — and he added to that total in Game 1 of the 2026 World Series against the Tampa Bay Rays. That’s not a footnote. Only six relievers in MLB history had ever reached 12 scoreless innings in a single postseason, and Ashby just put his name on that list alongside Mariano Rivera, Goose Gossage, and Wade Davis.
The List Is Short — and the Names Are Heavy
Before Ashby, the only relievers to throw at least 12 consecutive scoreless innings in a single postseason were Ken Dayley (1985), Mariano Rivera (1998 and 1999), Goose Gossage (1981), John Rocker (1999), Cody Allen (2016), and Wade Davis (2014 and 2015). Rivera did it twice. Ashby got there in his first World Series appearance.
Dan Clark (@DanClarkSports) put it plainly on the night of October 23: Ashby is having one of the best postseasons by a reliever in baseball history. After Game 1, the number crossed the historical threshold without any debate.
This Didn’t Come Out of Nowhere
Ashby didn’t sneak up on anyone. In the 2026 regular season he went 13-3 with a 3.12 ERA over 89.1 innings — the second-most innings pitched by any reliever in baseball that year. He’d already made history before October even started: on June 17, he became the first reliever since Roy Face in 1959 to be the first pitcher in MLB to reach 10 wins, all coming out of the bullpen.
The postseason was just a continuation. Against the Padres in the NLDS he threw 5.2 scoreless innings across three games and earned the win in Game 4. Against the Dodgers in the NLCS he appeared in three of four games and picked up two saves. By the time Game 1 of the World Series arrived at American Family Field — Milwaukee hosting a World Series game for the first time — Ashby had already made seven appearances without allowing a run.
None of it is accidental. His sinker averages 97.7 mph and his slider generates a 56.6% whiff rate, the third-best individual pitch in all of baseball in 2026. Hitters know what’s coming. They still can’t hit it.
The Engine of a Historic Bullpen
Ashby isn’t working alone. The Milwaukee bullpen as a whole has posted a 1.33 ERA over 40.2 postseason innings, allowing just 22 hits and striking out 38. But Ashby has thrown 3.1 more innings than any other Brewers pitcher in these playoffs. He is the axis around which Milwaukee’s entire pitching plan rotates.
The Brewers came into this World Series as the NL’s No. 1 seed, facing the AL’s No. 1 seed in the Rays. It’s the first World Series since 1980 where neither team has ever won a championship. Someone is getting their first ring — and the odds that Ashby is the last pitcher standing on the mound when it happens are very real.
The Historical Conversation Is Already Open
To be fair about it: Mariano Rivera posted multiple postseasons with a 0.00 ERA and has more career October innings than anyone. Ashby isn’t surpassing Rivera. But he’s in that conversation — and just being in it says everything.
The Numbers Behind the Dominance
2026 Regular Season (89.1 IP, 1 start):
- ERA: 3.12 · xERA: 2.99 · WHIP: 1.31
- Strikeouts: 116 · Walks: 41 · K%: 30.3%
- Saves: 4 · Record: 13-3
- Sinker avg. velocity: 97.7 mph · Spin rate: 2,101 rpm
- Whiff rate: 32.1%
- Batting average against: .225
- Exit velocity allowed: 88.4 mph · Barrel rate allowed: 4.9%
Statcast Percentile Rankings (2026):
- xERA: 89th percentile
- K%: 93rd percentile (elite)
- Whiff %: 92nd percentile (elite)
- Fastball velocity: 92nd percentile (elite)
- Fastball spin rate: 12th percentile (among the lowest in MLB)
- xwOBA against: 89th percentile
- Barrels avoided: 89th percentile
