Walter (elbow) was activated from the 60-day injured list Thursday, Brian McTaggart of MLB.com reports.

EDGE Analysis

This move is procedural as the Astros set their 40-man roster for the offseason. Walter is recovering from Tommy John surgery and will miss the entire 2026 season.

Walter (elbow) underwent Tommy John surgery Monday, Chandler Rome of The Athletic reports.

EDGE Analysis

The Astros announced that Walter was slated for elbow surgery a couple of weeks ago, but now that we know he specifically underwent a Tommy John procedure, it's safe to assume the left-hander won't return to a big-league mound until 2027. It's a notable loss for the Astros' rotation, as Walter finished his first season in Houston with a 3.35 ERA and 0.93 WHIP over 53.2 innings spanning nine starts.

Walter will undergo surgery on his left elbow this week, Chandler Rome of The Athletic reports.

EDGE Analysis

The specifics on the nature of the procedure aren't clear, but more should be known after the surgery takes place. Walter was terrific this season when healthy for the Astros, collecting a 3.35 ERA and 52:4 K:BB over 53.2 innings covering nine starts. If it's UCL surgery that the 29-year-old needs, he would likely be out until the 2027 season.

The Astros transferred Walter (elbow) to the 60-day injured list Friday, Chandler Rome of The Athletic reports.

EDGE Analysis

Walter suffered a setback Monday in his recovery from left elbow inflammation and was shut down from throwing. He'll now be ineligible to return until Sept. 23, making a regular-season return uncertain. The 28-year-old has a 3.35 ERA in 53.2 big-league innings this season.

The Astros announced Monday that Walter has shut down from throwing following a recurrence of left elbow inflammation, Chandler Rome of The Athletic reports.

EDGE Analysis

Walter initially went on the 15-day injured list July 25, and after he resumed playing catch earlier this month, he encountered a setback. It's not clear at this point how long he might be shut down, but at this stage of the season, Walter's availability down the stretch is in question. He's been excellent for Houston in 2025, collecting a 3.35 ERA, 0.93 WHIP and 52:4 K:BB in 53.2 innings.

Walter (elbow) resumed playing catch Tuesday, and Astros manager Joe Espada relayed Sunday that the right-hander could throw off a mound in "the next few days," Matt Kawahara of the Houston Chronicle reports.

EDGE Analysis

Walter shouldn't be in line for an extended stay on the injured list given that he was able to start throwing again five days after being shelved with elbow inflammation. He still appears likely to be out for longer than the minimum 15 days, however. Through nine starts with Houston this season, the southpaw owns a 3.35 ERA, 0.93 WHIP and 52:4 K:BB in 53.2 innings, but in spite of his impressive numbers, he may be on the outside looking in for a rotation spot upon his return. Spencer Arrighetti (thumb), Cristian Javier (elbow) and Luis Garcia (elbow) are all in the midst of rehab assignments and could beat Walter back from the IL.

The Astros placed Walter on the 15-day injured list Friday, retroactive to July 24, due to left elbow inflammation.

EDGE Analysis

Walter threw seven innings in a start Wednesday, but his arm didn't recover as expected, and he'll require a stint on the injured list. Houston recalled reliever Nick Hernandez from Triple-A Sugar Land in a corresponding move, but it's unclear who will take Walters' spot in the rotation.

Walter did not factor into the decision Wednesday against the Diamondbacks, allowing one run on four hits and a walk over seven innings. He struck out five.

EDGE Analysis

Walter got off to an inauspicious start Wednesday, allowing a home run to Ketel Marte on his first pitch of the game. However, the damage would stop there, as the left-hander held the D-Backs scoreless over his final six innings while allowing just three more hits. While he doesn't have a win since June 27, Walter has delivered three consecutive quality starts, allowing just four runs over 19 innings in that span. His ERA is down to 3.35 with a 0.93 WHIP and a very impressive 52:4 K:BB across nine starts (53.2 innings) this season. Walter is currently in line to face the Nationals at home in his next outing.

Walter (1-3) allowed one run on three hits and a walk while striking out seven over six innings to take the loss Friday versus the Mariners.

EDGE Analysis

Walter put together his fifth quality start, but he was once again done in by a lack of run support. He's now at a 3.66 ERA, 0.96 WHIP and 47:3 K:BB through 46.2 innings over eight starts this season. His strong performance could lead to a tough decision for the Astros' management when the team's rotation is closer to full strength, as Walter has turned some heads during this stint in the majors. He's projected to make his next start at Arizona as Houston operates with a five-man rotation while waiting for some injured pitchers to complete rehab assignments.

Walter (1-2) took the loss Wednesday against the Guardians, giving up two runs on two hits and no walks in six innings. He struck out seven.

EDGE Analysis

Walter continues to provide length for the Astros, having now thrown at least five innings in each of his first seven starts in 2025. The 28-year-old southpaw also tallied 16 whiffs Wednesday, and he's now posted four quality starts for the year. Walter has logged a 3.98 ERA, 1.01 WHIP and a pristine 40:2 K:BB through his first 40.2 frames prior to the All-Star break, and he should continue to hold down a major-league roster spot to help eat innings for Houston's injury-riddled rotation.