Jordan Walker warm, hot, and cold

Was Jordan Walker's 2026 a breakout or a comeback? Some of each. Walker played 158 games in 2026, the most of his career. He hit 29 home runs and drove in 102 runs.

On April 9, 2026, 700 Clark asked whether Walker had something at 24 that he did not have at 21. He had opened 2026 hitting .300 with a .650 slugging percentage over 11 games. The answer was mostly yes. He reached that pace in three more 11-game stretches. Over his other 623 plate appearances in 2026, he hit .267 with a .453 slugging percentage. The trade the April piece spotted, more strikeouts for more power, held all year.

OPS adds a hitter's on-base percentage to his slugging percentage. Walker's OPS was .793 in 2026, a hair above the .787 he posted as a 21-year-old rookie in 2023. In between came two short, poor seasons.

History says a jump like his usually holds up in part. Young hitters who climbed from where Walker started to about where he finished kept most of the gain the next season, on average.

Walker got back to his rookie OPS a different way. He homered in 4.3% of his plate appearances in 2026, up from 3.4% in 2023. His on-base percentage was lower, .327 in 2026 against .342 in 2023.

He struck out in 26.1% of his plate appearances in 2026. That was more than the 22.4% of his rookie year, and well below the 31.8% of 2025.

His 29 home runs in 2026 were the most by a Cardinal 24 or younger since Albert Pujols hit 46 in 2004. They were also the most by any Cardinal since 2022. That year Paul Goldschmidt hit 35 and Nolan Arenado hit 30.

Since 1901, hitters 25 or younger have had 3,046 pairs of back-to-back seasons with at least 300 plate appearances in each. In 54 of them, OPS rose as much as Walker's did from 2025 to 2026. Part of any jump that size is a bounce back from a bad year, and 2025 was his worst.

Through June 2026, he hit 18 home runs with an .853 OPS. From July on, he hit 11 with a .730 OPS. His mark from July on was below the middle of the National League's regulars.

He did hit right-handed pitchers again. His OPS against them was .554 in 2025 and .769 in 2026, over 492 plate appearances.

Among hitters who spent all of 2026 in the National League, 13 hit more home runs than Walker. Only four drove in more runs. One was his teammate Alec Burleson, who led the majors with 116 in 2026.

A qualified hitter has at least 502 plate appearances. Of 68 qualified hitters who spent all of 2026 in the National League, 27 had a higher OPS than Walker's .793.

Across the majors, six hitters 24 or younger hit more home runs in 2026. The Cubs' Pete Crow-Armstrong led them with 45.

We found 51 hitters who looked like Walker going in. Each was 25 or younger and had at least 300 plate appearances in each of two straight seasons. His OPS was .650 or lower in the first season. It rose by .150 or more in the second, to no higher than .850. The last jump in the group came in 2023.

Six in ten kept at least half the gain. The typical hitter kept 77% of it. The group's jump seasons averaged .770, a little below Walker's .793.

Cardinals in the group show the range. Bernard Gilkey went from .630 in 1991 to .792 in 1992, then .851 in 1993. Jack Smith went from .548 in 1919 to .829 in 1920, then .838 in 1921. Frank Snyder went from .572 in 1914 to .740 in 1915, then fell to .598 in 1916.

Why Walker improved is outside our data: swing changes, health, coaching and Statcast measures such as exit velocity. So is why he played 51 games in 2024 and 111 in 2025. We left out his defense. The comparison group describes past hitters and is no forecast for 2027. It matches Walker's bad year and his jump, but not his strong rookie season before them. The one hitter who fell short of 100 plate appearances the next season was Connie Ryan, whose jump came in 1944.

2026 figures come from MLB's official data (statsapi): Walker's season lines and splits, his box scores game by game, and every 2026 hitter's box scores summed by team. The box-score sums match his season line. History comes from the Lahman database, 1901 through 2025. A player's stints for more than one team in a season are added together. Plate appearances are at-bats plus walks, hit-by-pitches, sacrifice hits and sacrifice flies. OPS is figured from the counting stats. Ages are on June 30 of each season. A qualified hitter had 502 plate appearances, 3.1 per team game. "Kept half or more" means the next season's OPS was at least halfway from the first season's OPS to the jump season's. The next season counts when the hitter had at least 100 plate appearances. The middle of the National League's regulars is the median OPS of its qualified hitters. A hot stretch is a run of 11-game windows that each met a .300 average and a .650 slugging percentage, the bar the April 9 piece used; windows that share a game count as one stretch.