Injuries Put the Seasons of Zack Wheeler and Josh Hader in Doubt

The Astros and Phillies sit atop their respective divisions despite weathering injuries to some of their top pitchers, and now both teams face the prospect of finishing out the regular season — or perhaps going even longer — without one of their best. On Tuesday, the Astros placed Josh Hader on the 15-day injured list with what was initially described as a shoulder strain; on Friday, they clarified that he has been diagnosed with a shoulder capsule sprain. On Saturday, the Phillies announced that Zack Wheeler had landed on the IL due to “a right upper extremity blood clot” near his shoulder.
The Wheeler injury is the more serious of the two, as blood clots can be life-threatening if untreated, and career-threatening even if they are. Fortunately, it sounds as though the Phillies’ medical team caught this one before it could become an even more serious situation. Wheeler had struggled to some degree since throwing a 108-pitch complete-game one-hitter on July 6 against the Reds, with his ERA and FIP rising as his velocity trended downward. His scheduled August 8 start against the Rangers was pushed back by two days due to shoulder soreness. An MRI taken at the time came back clean, but even so, he set season lows for the average velocity of all six of his offerings once he finally took the mound on August 10.
Zack Wheeler grinded his way through 5 innings to get his 1st win in more than a month … but his velocity was down significantly and his fastball command continued to elude him.
There will be a lot of eyes on his next start. pic.twitter.com/IIF2mSnR0V
— Paul Casella (@Paul_CasellaMLB) August 10, 2025
Both Wheeler and manager Rob Thomson downplayed concerns about Wheeler’s waning velocity at the time. While the 35-year-old righty’s velocity rebounded by 1-2 mph in his August 15 start against the Nationals, he struggled with his command and lasted just five innings for the second start in a row — the first time all season he’d failed to go longer than five in back-to-back starts. Afterwards, Wheeler reported feeling “a little heaviness” on his right shoulder, and an examination on Saturday revealed the blood clot. “Yesterday, some symptoms had changed,” said head athletic trainer Paul Buchheit on Saturday. “Doctors were great in helping to diagnose and expedite that diagnosis this morning.” Read the rest of this entry »








