Cardinals closer Riley O'Brien now owns the sole lead in National League saves, reaching 38 on Sunday, September 20, 2026, and moving past San Diego's Mason Miller to stand alone atop the NL leaderboard. With just under two weeks left in the regular season, O'Brien's 38 saves put the St. Louis Cardinals' bullpen anchor in position to finish as the top save-getter in the senior circuit. It is a significant individual marker for a pitcher who has steadily built his role in St. Louis, and a number worth examining closely as the 2026 season heads into its final stretch.

Riley O'Brien's 2026 NL Saves Lead: By the Numbers

Thirty-eight saves is the number, and the gap between O'Brien and the runner-up is roughly 2.6 percent — razor thin, but enough to call his alone. The NL saves race has been a two-man story down the stretch, with O'Brien and Miller trading positions at the top. As of September 20, O'Brien holds the edge.

To put 38 saves in context, you have to look at who O'Brien has been across his career. His 2025 season showed a reliever settling into a consistent late-inning role: 42 appearances, 48 innings pitched, a 2.06 ERA, and 6 saves out of 9 opportunities. His WHIP sat at 1.15, and he struck out 45 batters while walking 22 — a strikeout-to-walk ratio of 2.05. Those numbers reflected a reliever with swing-and-miss stuff and enough command to hold a lead, though not without some roughness around the edges.

The jump from 6 saves in 2025 to 38 in 2026 is a substantial leap — one that reflects an expanded closer role. The underlying 2025 profile showed the ability to miss bats and limit hard contact, with a ground-out to air-out ratio of 1.63, a home run rate of just 0.38 per nine innings, and inherited runners scoring at a manageable clip (3 of 10 scored). The building blocks were there.

What Makes 38 Saves Significant in the NL Race

The NL saves title is a legitimate pitching honor, and chasing it this late in September with the lead outright is not a small thing. O'Brien has been the Cardinals' primary closer, and whatever St. Louis's record looks like at this point in the season, he has been handed save opportunities and converted them at a rate that now sits at the top of the league.

Mason Miller and the Padres are the competition here. Miller had been a force in San Diego's bullpen and held a share — or the outright lead — in NL saves at various points this season. O'Brien moving ahead of him on September 20 is a direct result of converting a save opportunity while Miller did not add one on the same date. The margin is narrow enough that this could flip again before the final out of the regular season is recorded.

What Comes Next for O'Brien and the Cardinals

The Cardinals have at most around 10 games remaining in the 2026 regular season. Every save opportunity O'Brien gets from here will matter not just for his individual ledger, but for the ballclub's win total. Closers who sit at 38 saves this late in September tend to finish in the low-to-mid 40s if their team stays competitive and generates save situations.

  • O'Brien's 38 saves lead all NL pitchers as of September 20, 2026
  • He holds a 2.6 percent margin over the NL runner-up, Mason Miller of the Padres
  • His 2025 baseline ERA of 2.06 across 48 innings established him as a legitimate late-inning arm
  • He has been on the Cardinals' active roster since April 16, 2026, working in a closing role

The saves title is not won yet. But O'Brien is in the driver's seat, and the Cardinals have a chance to send their closer home with the NL's top mark at the position. Keep an eye on every save situation Busch Stadium — and Cardinals road games — produces from here through the end of the regular season. O'Brien has earned the right to be watched closely in these final days.