Jordan Walker has given the Cardinals plenty to celebrate this season, but one piece of his game still looks like a work in progress: how he handles the strike zone when the ABS challenge system is in play.
The 2026 Home Run Derby champion is set to get another shot at rubbing it in Kyle Schwarber’s face when the Phillies arrive at Busch Stadium this week. Walker’s All-Star showcase will be remembered, but once the regular season resumed, St. Louis still had reason to keep an eye on his plate discipline.
There has been progress. Walker has quieted some of the worry about a second-half drop-off tied to the derby by hitting his first home run since then and carrying an OPS above .700 over the past month.
His contact rate has improved, and his strikeout percentage has come down. Even so, his judgment on borderline pitches has not matched the rest of his offensive step forward.
That issue has become more noticeable as clubs settle into their challenge approach with ABS. The Cardinals have been one of the most conservative teams in the majors when it comes to challenging strike calls, with their hitters taking issue with 99 calls this season.
That ranks fourth-lowest in baseball. The team has succeeded on only 47% of those challenges, which ranks 19th, and Walker’s choices have dragged that number down.
Masyn Winn told FanGraphs a couple of months ago that he was being stubborn with the system and suggested the helmet taps should go to players like Walker. Winn has only challenged eight times, but he has won six of them.
That’s a tiny total for a player who, according to Baseball Savant, has had 45 “reasonable opportunities” to challenge. Compared with Walker, it may be time for the two to swap approaches.
Walker has been the Cardinals’ busiest challenger. Across 488 plate appearances, he has challenged a strike 15 times, second on the team behind Ivan Herrera’s 19 helmet taps.
The results have not been strong enough. Walker has gotten only five calls overturned, leaving him with a 33% success rate that is tied for 14th-worst in baseball among players with at least 10 challenges.
Even with a 7% drop in his strikeout rate this season, the numbers suggest there is still room for sharper pitch recognition.
Savant’s ABS data does show one important detail: Walker has not had a strikeout overturned or turned a strike into ball four. That suggests his timing on the challenges may not be as damaging as the raw success rate makes it look.
The numbers also leave some gray area, since Savant does not show the count, inning, or score when the helmet tap happened. It’s possible Walker is using those moments to confirm his read on the strike zone, especially late in games when a failed challenge carries less risk.
Still, the bigger picture is hard to miss. Walker’s 2026 season has been a breakout in just about every direction, with career bests in his slash line, homers, RBIs, and stolen bases, plus a major drop in strikeouts.
He has done it over more than 100 games, which makes the breakout feel real. If the main concern left is his ABS challenge success, that’s a pretty good place for the Cardinals to be.
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