Chisholm IL Stint Hands Nuñez Steals Crown as Markets Price 86%

Nasim Nuñez leads Major League Baseball with 46 stolen bases as of September 9, 2026, and the Pro Baseball Steals Leader market prices him at 86% on Kalshi and 88% on Polymarket. That probability climbed 13 percentage points in three days, the sharpest move this market has produced all season, after Jazz Chisholm Jr. was placed on the injured list with 40 steals and no realistic path back into the race.

Chisholm had been the only player within striking distance. With roughly 20 games remaining before the September 28 resolution date, Nuñez's lead looks close to insurmountable. The market still assigns a 14% chance that someone else finishes on top, a gap worth examining before treating this as settled.

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Nasim Nuñez Is the MLB Steals Leader, and Now the Market Agrees

Nuñez's 46 steals put him six ahead of Chisholm's frozen total and well clear of every other active player. He has done it on a modest offensive profile: a .210 batting average, four home runs, and 35 RBIs across 135 games. His entire value proposition on the basepaths is speed rather than on-base ability, which makes the stolen base crown a fitting capstone.

The market's move from 73% to 86% reflects not a gradual accumulation of steals but a sudden structural change in the competitive field. Before Chisholm's injury, the race had a plausible second-place finisher who could have closed a six-steal gap over three weeks. Now it doesn't. Chandler Simpson, holding the second-highest active probability at 8%, would need to nearly double his season total in fewer than 20 games to overtake Nuñez.

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Jazz Chisholm Jr.'s IL Placement Cleared the Field

Chisholm's injury is the catalyst. The 13-point surge over the past 72 hours aligns directly with the removal of the only player who had a realistic path to catching Nuñez.

Before the IL stint, Chisholm sat at 40 steals, trailing by six. At the pace both players had maintained, that deficit was challenging but not impossible to erase over a full September. The injured list changed the calculus entirely. Even if Chisholm returns before the regular season ends on September 28, the combination of recovery time and limited remaining games makes a comeback functionally impossible. The market agrees: his probability collapsed to 1%.

This is not a case where multiple competitors lost ground gradually. One player was eliminated by a single event, and the market repriced accordingly. NBC Sports reported Nuñez's 46th steal just as the competitive picture was already shifting in his favor.

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The 14% Case Against Nuñez: What Would Have to Go Wrong

The chart above shows a clean, steep ascent from 73% to 86%. But that remaining 14% deserves scrutiny, because prediction markets rarely leave that much implied probability on the table for pure noise.

The most credible failure scenario is an injury to Nuñez himself. If the Nationals' infielder lands on the IL in the final weeks, his steal total freezes at 46, and any active player with a hot September could close the gap. Bobby Witt Jr. holds a 2% probability, and several other names (Randy Arozarena, CJ Abrams, Pete Crow-Armstrong) each sit at 1%. Individually none of these players are threats. Collectively, they represent the market's hedge against a Nuñez absence.

A second, less likely scenario: Nuñez stays healthy but stops running. A managerial decision to protect him late in a season where Washington is out of contention could reduce his opportunities. But benching a player chasing a franchise record (Nuñez is one steal away from tying CJ Abrams's club record of 47) seems unlikely absent injury.

The honest assessment: 86% looks correct, possibly even slightly conservative. The only realistic path to a Nuñez loss requires his own physical availability to change. No active competitor is positioned to catch him on merit alone.

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Live Odds: Pro Baseball Steals Leader

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Kalshi prices Nuñez at 85%, Polymarket at 88%. That three-point spread between platforms reflects minor differences in market composition rather than a genuine disagreement about probability. Both venues converge on the same conclusion: Nuñez is the overwhelming favorite.

The resolution date of September 28 means this market has roughly 17 days of gameplay left. In that window, Nuñez needs to do almost nothing. He doesn't need to add steals. He needs to stay on the field while no one else catches fire. That is the kind of passive win condition that prediction markets tend to price efficiently.

For real-time probability updates on this race and every other outcome, the Pro Baseball Steals Leader odds page tracks all 24 candidates through resolution.

The bottom line: Chisholm's injury converted a competitive race into a probability exercise. Nuñez at 86% is pricing the only variable that matters now, which is his own health over the next three weeks. If he stays in the lineup, the steals crown is his.