Josh Naylor needs one stolen base to make baseball history. The Seattle Mariners first baseman is on the verge of becoming the first player at his position to record back-to-back 30-plus stolen base seasons since George Sisler — a name that belongs in the same sentence as the words "dead ball era." As of Monday, September 21, 2026, Naylor sits one bag away from a milestone that no first baseman has reached in over a century of professional baseball. For a position not exactly synonymous with speed, what Naylor is doing on the basepaths is genuinely extraordinary.

The Number: One Stolen Base Away From Back-to-Back 30-Plus Seasons

The threshold here is 30 stolen bases in consecutive seasons — a benchmark that sounds modest when you hear it applied to outfielders or middle infielders, but becomes almost surreal when the position in question is first base. Naylor has already cleared 30 stolen bases in the 2026 season and did so in 2025 as well. One more swipe of a bag completes the back-to-back and plants his name alongside George Sisler in the record books.

Sisler, who played the bulk of his Hall of Fame career in the 1910s and 1920s, was a singular talent — a first baseman who ran like an outfielder in an era when the game looked nothing like it does today. The fact that no first baseman managed back-to-back 30-steal seasons between Sisler's time and now tells you everything you need to know about how rare this combination of power position and baserunning production truly is.

The Context: What Makes This Milestone Significant

First base is, by design and by tradition, a position for sluggers. Teams park their biggest run producers there, players whose offensive value is measured in exit velocity and home run totals, not stolen base percentages. The position demands a presence in the middle of the lineup, not a disruptive force on the basepaths.

Naylor breaks that mold entirely. He has spent the 2026 season — and the 2025 season before it — doing something first basemen simply do not do. Posting 30-plus stolen bases once at the position would be a conversation starter. Doing it in consecutive years elevates the conversation to a different level.

It is also worth noting that stolen base totals do not accumulate by accident. Thirty-plus stolen bases requires consistent opportunity, good instincts, and execution over a full season. Doing it twice in a row requires all of that plus durability and sustained aggression on the bases. Naylor has delivered on every count.

The Why: A Skill Set That Defies Positional Convention

The data on Naylor's 2026 season does not need to be embellished. The stolen base number speaks for itself. At a position where 10 stolen bases would make a player noteworthy on the basepaths, Naylor has lapped the field — twice. His ability to combine first base production with elite baserunning volume is the engine behind this chase.

There is no verified explanation available for why Naylor has developed into this kind of basestealing threat at first base. What the numbers show is that it has happened, that it is sustained, and that it is historically significant regardless of the mechanism behind it.

What Comes Next: One Opportunity to Close It Out

With the 2026 regular season in its final stretch, Naylor has every opportunity to secure that 31st stolen base before the schedule runs out. The Mariners will continue playing through the end of the regular season, giving Naylor the chances he needs to reach the milestone.

  • Naylor currently sits at 30 stolen bases in the 2026 season
  • He also recorded 30-plus stolen bases in 2025
  • One more stolen base makes him the first first baseman with back-to-back 30-plus stolen base seasons since George Sisler
  • Sisler played the bulk of his career in the 1910s and 1920s, meaning no first baseman has matched this feat in over a century

When Naylor gets that stolen base — whether at T-Mobile Park or on the road — it will be one of the more quietly remarkable individual accomplishments of the 2026 baseball season. History does not always announce itself loudly. Sometimes it arrives on a secondary lead and a good jump.