On September 20, 2026, the St. Louis Cardinals beat the Washington Nationals 5-3, a two-run margin that could have swung either way in the late innings. Iván Herrera, the Cardinals' designated hitter, made sure it didn't: he hit two home runs in the same game, turning an ordinary September matchup into one of the rarer offensive lines the league produced all year.
Across every hitter who played in a major-league game on September 20, the average was 0.125 home runs per player — essentially one homer for every eight batters who stepped to the plate that day. Herrera hit two, by himself, in a single game. That gap works out to a z-score of 5.27 relative to that day's full population of hitters. For scale: a z-score of 3.0 already shows up roughly once a season across the entire league, and a z-score of 4.0-plus is closer to a once-every-several-seasons event for any individual performance. Herrera's night clears both of those bars by a wide margin — this wasn't just a good game, it was a statistical extreme.
Statcast's per-homer breakdown for this specific game — exit velocity, launch angle, the stuff that usually explains how a ball clears the wall — isn't available in the record, so we can't say how hard either pitch was hit or at what angle it left the bat. What we do know from the surface numbers: Herrera came into the day a .247 hitter with a .358 on-base percentage and a .746 OPS, a solid-but-unspectacular offensive profile, not someone riding an obvious hot streak. Two home runs in one night is a jump from that typical game log, which is part of what makes it hard to see coming and easy to notice after the fact.
Statcast's per-homer breakdown for this specific game — exit velocity, launch angle, the stuff that usually explains how a ball clears the wall — isn't available in the record, so we can't say how hard either pitch was hit or at what angle it left the bat. What we do know from the surface numbers: Herrera came into the day a .247 hitter with a .358 on-base percentage and a .746 OPS, a solid-but-unspectacular offensive profile, not someone riding an obvious hot streak. Two home runs in one night is a jump from that typical game log, which is part of what makes it hard to see coming and easy to notice after the fact.
Zoom out and the season arc gets more interesting. Herrera has 18 home runs in 155 games this year, against a career total of 42 homers across 358 games since his 2022 debut — meaning close to half of his career power production has come in this single season, and two of those 18 season homers arrived in one night. That's roughly one-ninth of his full-season total delivered in a single game. Whether that reflects a real shift in his power output or a two-swing outlier sitting on top of an otherwise middling year is something only more games can settle.
The next couple of weeks are the actual test. If Herrera is quietly turning into a more dangerous power threat, watch for his home run pace to accelerate beyond the rate that got him to 16 through his first 153 games — a third homer inside his next five games would be a real signal, not noise. If this turns out to be an isolated two-swing night instead, expect his numbers over the season's final stretch to settle right back toward that .746 OPS he carried into September 20.
Either way, September 20 is now the outlier data point in Iván Herrera's age-26 season — the night an otherwise unremarkable batting line briefly looked like something else entirely.