The concern is particularly significant because Wheeler was arguably one of the best pitchers in baseball during the first half of the season. After returning from thoracic outlet decompression surgery and missing the beginning of the campaign, he quickly erased questions about whether he would be the same pitcher. Through his first 16 starts, Wheeler posted a 2.16 ERA, looking every bit like the ace Philadelphia expected to lead its rotation.
But that version of Wheeler has disappeared over the past several weeks.
Wheeler’s sudden collapse has changed the Phillies’ pitching outlook
The turning point came after Wheeler’s impressive July 21 start against the Los Angeles Dodgers. In that outing, he surrendered only two runs across seven innings, walked nobody and struck out nine. At that point, Wheeler appeared to be heading toward another dominant finish to the season.
Since then, however, the results have been dramatically different.
Wheeler has made six starts since that Dodgers performance and owns an 8.51 ERA during that stretch. He has also struggled to work deep into games, failing to pitch beyond roughly five innings consistently. The problem has not simply been an occasional bad inning; his command and overall effectiveness have deteriorated over multiple outings.
That trend became impossible to ignore during Philadelphia’s recent trip to Seattle.
Mariners handed Wheeler his worst outing of 2026
On Aug. 24, the Seattle Mariners dismantled Wheeler during a 9-2 victory, ending Philadelphia’s nine-game winning streak.
Wheeler surrendered eight runs on nine hits, including four home runs, while walking five batters and striking out four. He lasted only four-plus innings and threw 103 pitches. Cal Raleigh supplied three of Seattle’s home runs, while Julio Rodríguez also connected for a three-run blast.
The outing was particularly alarming because it represented a dramatic departure from the pitcher Phillies fans had watched dominate opponents for much of the season.
According to MLB.com, Wheeler became the first Phillies pitcher in the Modern Era, dating to 1900, to allow at least four home runs while also issuing at least five walks in the same game. Four of the nine hits he surrendered left the ballpark.
The performance also pushed his ERA significantly higher after he had spent much of the season among the National League’s top pitchers.
The command problem may be the biggest concern
Perhaps more troubling than the home runs is Wheeler’s recent inability to consistently locate his pitches.
Over his previous four starts, Wheeler had walked 15 batters, an unusually high number for a pitcher who has traditionally been one of Philadelphia’s most reliable strike-throwers. His inability to get ahead in counts has resulted in longer at-bats, higher pitch counts and shorter outings.
Wheeler acknowledged that his performance has been inconsistent.
He explained that it has been “hit-or-miss” with what he has on a particular day and admitted that he isn’t accustomed to having to fight through that kind of inconsistency. At the same time, he remains confident that his ability is still there.
That confidence is important for Philadelphia because there is little time left for Wheeler to work through the problem.
Phillies insist Wheeler is healthy
The Phillies have not indicated that Wheeler is dealing with a new injury.
That is perhaps the biggest reason the organization remains relatively optimistic despite the alarming numbers. Wheeler has said that he feels healthy and strong, while the team believes he can correct whatever has gone wrong mechanically or with his command.
Interim manager Don Mattingly also pushed back against the idea that Wheeler has suddenly lost his ability.
Mattingly acknowledged that struggles naturally create concern, but he made it clear that the Phillies are not viewing Wheeler as a pitcher who has permanently lost his effectiveness. The organization believes the veteran ace can make the necessary adjustments.
That confidence will be tested quickly.
The timing could not be worse
Philadelphia can survive a struggling fourth or fifth starter during the regular season. The same problem becomes much more dangerous when it involves the pitcher expected to lead the postseason rotation.
For much of the year, the Phillies appeared capable of entering October with a formidable top three featuring Wheeler, Cristopher Sánchez and Jesús Luzardo. That group gave Philadelphia a potentially dangerous playoff rotation, particularly in a postseason environment where teams often shorten their rotations and rely heavily on their best starters.
But Wheeler’s recent struggles complicate that plan.
If he enters October still struggling with command and giving up hard contact, Philadelphia could be forced to reconsider how it structures its playoff rotation. Instead of confidently handing Wheeler the ball in a crucial postseason opener, the Phillies may have to evaluate his final few regular-season starts carefully.
The warning comes despite Philadelphia’s strong overall form
There is an important reason Philadelphia cannot simply panic over Wheeler’s numbers: the team itself is playing excellent baseball.
The Phillies recently ended a nine-game winning streak against Seattle, but they bounced back and continued their strong stretch. On Saturday, Philadelphia defeated the Los Angeles Angels 4-2 in 10 innings, winning its 12th game in its previous 14. Sánchez was outstanding in that victory, throwing seven scoreless innings with eight strikeouts.
That performance demonstrated why Philadelphia remains dangerous even while Wheeler works through his problems.
But it also highlights the importance of getting Wheeler right.
Sánchez can dominate. Luzardo can provide quality innings. The bullpen has increasingly important pieces. Yet Philadelphia’s ceiling in October is considerably higher if Wheeler returns to the form he showed earlier this season.
Wheeler’s early-season dominance makes the slump even stranger
The current situation is difficult to explain because Wheeler was not merely adequate before the downturn—he was exceptional.
MLB noted earlier this season that Wheeler’s 2026 performance was arguably better than anything he had previously produced. After returning April 25, he quickly established himself as one of the Phillies’ most dependable arms and at one point carried a 2.01 ERA through his first 10 starts.
By July, his ERA remained around the low-2.00 range, putting him in the conversation for another major award-caliber season. The fact that the same pitcher has now posted an 8.51 ERA across his last six starts is what makes the recent decline so concerning.
This is not simply a case of an average pitcher going through a rough patch.
It is an elite pitcher suddenly struggling to execute pitches he had been making consistently for months.
Philadelphia needs answers before October
The Phillies do not necessarily need Wheeler to dominate every remaining start.
What they need is evidence that the underlying problems are being corrected.
The organization will be watching his command, pitch efficiency, ability to avoid the long ball and ability to work deeper into games. If Wheeler begins consistently reaching six or seven innings again while limiting walks and hard contact, much of the concern could disappear quickly.
But if the struggles continue, the Phillies could enter the postseason with their biggest strength suddenly becoming a potential weakness.
That is why the warning surrounding Wheeler matters so much.
Philadelphia has constructed a roster capable of competing deep into October, and the club’s recent surge has strengthened expectations. But playoff baseball is often decided by starting pitching, and the Phillies cannot afford to have their ace searching for answers when the games become most important.
For now, the message from inside the organization is clear: Wheeler is healthy, the Phillies still believe in him, and nobody is ready to declare that the ace has lost his ability. But his recent performances have created enough concern that the Phillies need to see a turnaround soon.
The veteran’s next starts will therefore carry far more significance than a normal August or September outing.
Zack Wheeler does not need to prove that he is capable of being an ace he has already done that for years. He needs to show Philadelphia that the dominant version of himself that appeared during the first half of 2026 is still there. With October rapidly approaching, the Phillies may not have much time left to find out.
Leave a Reply