11:22 AM - Zach Jackson (OAK) Athletics outrighted Jackson to Triple-A Las Vegas on Tuesday after he cleared waivers.

9:27 AM - Zach Jackson (OAK) Athletics optioned Jackson to Triple-A Las Vegas on Wednesday.

10:56 AM - Zach Jackson (OAK) (elbow/appendix) has made two appearances for the Athletics thus far during Cactus League play, covering two scoreless innings and striking out a batter while giving up one hit and one walk.

5:08 PM - Zach Jackson (OAK) (elbow) underwent an appendectomy Monday and is without a timeline to resume his rehab program, Martin Gallegos of MLB.com reports.

2:28 PM - Zach Jackson (OAK) (elbow) allowed two earned runs on two solo home runs while also recording two strikeouts over one inning in Single-A Stockton's win over Lake Elsinore on Saturday.

11:20 AM - Zach Jackson (OAK) (elbow) began a rehab assignment with Low-A Stockton on Wednesday.

12:12 PM - Zach Jackson (OAK) (elbow) threw another bullpen session Saturday, the Associated Press reports.

12:01 PM - Zach Jackson (OAK) (elbow) did not feel any residual effects from Saturday's bullpen session, the team's official site reports.

1:14 PM - Zach Jackson (OAK) (elbow) is slated to throw a bullpen session Saturday, the team's official site reports.

2:58 PM - Zach Jackson (OAK) transferred Jackson (elbow) from the 15-day injured list to the 60-day IL on Wednesday.

10:54 AM - Zach Jackson (OAK) (elbow) has apparently reached the point where he is pain-free and will begin throwing next week, the team's official site reports.

11:18 AM - Zach Jackson (OAK) Athletics announced Wednesday that Jackson (elbow) could begin a throwing program next week, Martin Gallegos of MLB.com reports.

3:02 PM - Zach Jackson (OAK) was placed on the 15-day injured list by the Athletics on Friday with a right flexor tendon strain.

12:22 PM - Zach Jackson (OAK) (2-1) got the win against the Reds on Sunday, firing a scoreless ninth inning during which he allowed two hits and recorded two strikeouts.

1:27 PM - Zach Jackson (OAK) (0-1) was charged with the loss in an extra-inning defeat at the hands of the Guardians on Wednesday, allowing two runs (one earned) on a hit, a walk and a wild pitch over one inning. He struck out one.

9:26 AM - Zach Jackson (OAK) (shoulder) is listed as an available option out of the Oakland bullpen for Monday's Cactus League game against the Rockies, Matt Kawahara of the San Francisco Chronicle reports.

7:12 PM - Zach Jackson (OAK) manager Mark Kotsay said it's unlikely that Zach Jackson (shoulder) will pitch again this season, Martin Gallegos of MLB.com reports.

12:05 PM - Zach Jackson (OAK) recent MRI revealed a shoulder strain, and he's expected to rest for all of next week before likely embarking on a rehab assignment, the team's official site reports.

6:59 PM - Zach Jackson (OAK) was placed on the 15-day injured list Tuesday with right shoulder inflammation.

4:02 AM - Zach Jackson (OAK) recorded a save Wednesday against the Angels, tossing a perfect frame during which he struck out two batters.

4:02 AM - Zach Jackson (OAK) recorded a save Wednesday against the Angels, tossing a perfect frame during which he struck out two batters.

1:39 PM - Zach Jackson (OAK) (2-3) took the loss against the White Sox on Saturday, allowing an earned run on a hit and a wild pitch over one-third of an inning.

1:39 PM - Zach Jackson (OAK) (2-3) took the loss against the White Sox on Saturday, allowing an earned run on a hit and a wild pitch over one-third of an inning.

12:28 PM - Zach Jackson (OAK) recorded his second save in a win over the Rangers on Saturday, firing a scoreless ninth inning during which he recorded two strikeouts.

1:20 PM - Zach Jackson (OAK) recorded his 17th hold in a win over the Astroson Saturday, allowing a hit and recording a strikeout over a scoreless two-thirds of an inning.

2:59 PM - Zach Jackson (OAK) secured his 13th hold in a win over the Royals on Saturday, firing a scoreless eighth inning during which he issued a walk and recorded two strikeouts.

8:28 AM - Zach Jackson (OAK) (2-2) earned the win Saturday against the Royals. He allowed no runs on no hits while striking out one and walking none over one inning.

7:11 PM - Zach Jackson (OAK) (1-2) was charged with two runs on two walks and one strikeout in two-thirds of an inning, taking the loss Thursday versus the Mariners.

3:27 PM - Zach Jackson (OAK) was credited with his third hold in a loss to the Guardians on Thursday, allowing an earned run on a hit and a walk over one-third of an inning.

1:01 PM - Zach Jackson (OAK) secured his fifth hold in a win over the Tigers on Monday, firing 1.1 perfect innings during which he recorded two strikeouts.

3:03 PM - Zach Jackson (OAK) fired 1.2 scoreless innings in a loss to the Guardians on Saturday, allowing a walk while recording three strikeouts.

1:54 PM - Zach Jackson (OAK) recorded his third hold in a win over the Rangers on Sunday, firing two perfect innings during which he recorded two strikeouts.

11:14 AM - Zach Jackson (OAK) struck out the lone batter he faced on four pitches en route to recording his first career save Tuesday in the Athletics' 2-1 win over the Orioles.

2:57 PM - Zach Jackson (OAK) has allowed an earned run on two hits and a walk while also recording two strikeouts across two innings in his first two appearances.

11:59 PM - Zach Jackson (OAK) was informed Sunday that he's made the Athletics' Opening Day roster, Scott Bordow of MLB.com reports.