5:53 PM - Brandon Walter (Hou) (elbow) underwent Tommy John surgery Monday, Chandler Rome of The Athletic reports.

4:18 PM - Brandon Walter (Hou) will undergo surgery on his left elbow this week, Chandler Rome of The Athletic reports.

4:10 PM - Brandon Walter (Hou) Astros transferred Walter (elbow) to the 60-day injured list Friday, Chandler Rome of Athletic reports.

4:04 PM - Brandon Walter (Hou) has been shut down from throwing following a recurrence of left elbow inflammation, Chandler Rome of The Athletic reports.

9:30 AM - Brandon Walter (Hou) (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.

3:18 PM - Brandon Walter (Hou) Astros placed Walter on the 15-day injured list Friday, retroactive to July 24, due to left elbow inflammation.

7:31 PM - Brandon Walter (Hou) 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.

4:39 PM - Brandon Walter (Hou) is slated to start Sunday's game against the Twins in Houston, Brian McTaggart of MLB.com reports.

5:25 PM - Brandon Walter (Hou) allowed two runs on six hits while striking out five across six innings, but he did not factor into Sunday's decision against the Guardians. He did not issue a walk.

11:29 AM - Brandon Walter (Hou) Astros recalled Walter from Triple-A Sugar Land to start Sunday's game against the Guardians, Brian McTaggart of MLB.com reports.

7:50 PM - Brandon Walter (Hou) will start Sunday against the Guardians, Brian McTaggart of MLB.com reports.

12:37 PM - Brandon Walter (Hou) is in Cleveland on Saturday and will be the 27th man on the Astros' roster, Matt Kawahara of the Houston Chronicle reports.

10:24 AM - Brandon Walter (Hou) Astros optioned Walter to Triple-A Sugar Land on Wednesday, Matt Kawahara of the Houston Chronicle reports.

2:44 PM - Brandon Walter (Hou) Astros selected Walter's contract from Triple-A Sugar Land on Tuesday, Chandler Rome of Athletic reports.

3:49 PM - Brandon Walter (Hou) Astros added Walter to their taxi squad Monday and are expected to have the lefty start Tuesday's game against the Rays, Chandler Rome of Athletic reports.

10:01 AM - Brandon Walter (Hou) Astros reassigned Walter to minor-league camp Thursday, Brian McTaggart of MLB.com reports.

9:54 AM - Brandon Walter (Hou) Astros signed Walter (shoulder) to a minor-league contract Thursday.

1:49 PM - Brandon Walter (Bos) Red Sox designated Walter (shoulder) for assignment Tuesday, Gabrielle Starr of the Boston Herald reports.

1:33 PM - Brandon Walter (Bos) Worcester transferred Walter (shoulder) from its 7-day injured list to the 60-day IL on Wednesday.

6:48 PM - Brandon Walter (Bos) will begin the season on the injured list due to a strained left shoulder, Chris Cotillo of The Springfield Republican reports.

9:27 AM - Brandon Walter (Bos) Red Sox optioned Walter to Triple-A Worcester on Wednesday, Pete Abraham of Boston Globe reports.

9:17 AM - Brandon Walter (Bos) struck out two over two hitless and scoreless innings in Tuesday's spring game against St. Louis.

3:30 PM - Brandon Walter (Bos) was optioned Friday to Triple-A Worcester, Chris Cotillo of The Springfield Republican reports.

6:32 PM - Brandon Walter (Bos) recalled Walter from Triple-A Worcester on Wednesday, Chris Cotillo of The Springfield Republican reports.

4:37 PM - Brandon Walter (Bos) was optioned to Triple-A Worcester on Saturday.

4:56 PM - Brandon Walter (Bos) recalled Walter from Triple-A Worcester on Friday, Pete Abraham of The Globe reports.

1:50 PM - Brandon Walter (Bos) was optioned to Triple-A Worcester on Friday, Chris Cotillo of The Springfield Republican reports.

11:21 AM - Brandon Walter (Bos) was recalled from Triple-A Worcester on Wednesday, Christopher Smith of The Springfield Republican reports.

1:57 PM - Brandon Walter (Bos) Red Sox optioned Walter to Triple-A Worcester on Monday, Jen McCaffrey of Athletic reports.

10:20 AM - Brandon Walter (Bos) was recalled from Triple-A Worcester on Tuesday, Ian Browne of MLB.com reports.

10:12 AM - Brandon Walter (Bos) is a candidate to be added to Boston's active roster this week, Christopher Smith of MassLive.com reports.

6:24 PM - Brandon Walter (Bos) Red Sox optioned Walter to Triple-A Worcester on Thursday, Chris Cotillo of Springfield Republican reports.

10:14 AM - Brandon Walter (Bos) was recalled from Triple-A Worcester prior to serving as the primary pitcher Thursday against the Twins, Chris Cotillo of The Springfield Republican reports.

5:48 PM - Brandon Walter (Bos) will be promoted from Triple-A Worcester and appear in Thursday's game against Minnesota, Chris Cotillo of The Springfield Republican reports.

3:42 PM - Brandon Walter (Bos) is in consideration to start for the Red Sox on Thursday at Minnesota, Chris Cotillo of The Springfield Republican reports.

5:17 PM - Brandon Walter (Bos) has a 4.19 ERA, 1.45 WHIP and 11:7 K:BB in 19.1 innings through four starts for Triple-A Worcester.

6:09 PM - Brandon Walter (Bos) Red sox optioned Walter to Triple-A Worcester on Monday.