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66 Daulton Jefferies SP

Oakland Athletics

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March 1, 2021 01:24 PM
Athletics' Daulton Jefferies: Impresses in spring debut
by RotoWire Staff | RotoWire

Jefferies was impressive during his one-inning start in Sunday's Cactus League loss to the Dodgers, Martin Gallegos of reports.

The promising right-hander made quick work of Mookie Betts, Corey Seager and Austin Barnes, needing just nine pitches, seven of which he threw for strikes, to record a clean opening frame. His strikeout of Betts on three pitches to open the game undoubtedly set the right tone, and Jefferies, who endured a rough introduction to the big leagues late last season in a tough outing against the Rangers, also focused on his breathing to remain relaxed. That helped the 25-year-old deploy his impressive arsenal despite the quick outing, with his fastball clocking in at 96 mph and Jefferies also utilizing both his cutter and developing slider with effectiveness.

February 21, 2021 10:28 AM
Athletics' Daulton Jefferies: Expected to push for time in '21
by RotoWire Staff | RotoWire

Jeffries is likely to begin the season in the minors but should push for a big-league opportunity at some point during the 2021 campaign, Shayna Rubin of The Mercury News reports.

The right-hander got a jarring introduction to big-league bats Sept. 12 of last season against the Rangers, when he allowed five earned runs on four hits, including two home runs, and two walks in the first inning. He was allowed to pitch a second inning, one that was scoreless. That represents the extent of Jefferies' MLB experience thus far. If Jefferies doesn't make the Opening Day roster, the 25-year-old is likely to start the season at Triple-A Las Vegas after posting a 3.66 ERA, 1.09 WHIP and a 72:7 K:BB across 64 innings over 21 appearances (12 starts) for Double-A Midland in 2019.

September 14, 2020 06:40 PM
Athletics' Daulton Jefferies: Returns to alternate site
by RotoWire Staff | RotoWire

The Athletics optioned Jefferies to their alternate training site Sunday.

Jefferies was designated as Oakland's 29th man for Saturday's doubleheader with the Rangers and made his MLB debut in the first game of the twin bill. He was roughed up in the start, lasting only two innings while giving up five runs on five hits and two walks. Oakland will require a sixth starter in the final week of the season with a doubleheader in Seattle on tap for Sept. 26, and Jefferies or Mike Minor would seemingly represent the most logical options to fill the opening in the rotation.

September 12, 2020 07:24 PM
Athletics' Daulton Jefferies: Takes loss in debut
by RotoWire Staff | RotoWire

Jefferies (0-1) took the loss in Game 1 of Saturday's doubleheader against the Rangers after surrendering five runs on five hits with one strikeout and two walks over two innings.

The 25-year-old gave up a three-run homer to Rougned Odor and a two-run shot to Ronald Guzman, which proved to be the only runs Texas would put up all afternoon. Jefferies seems unlikely to stick in the rotation, as the A's will be in need of extra pitchers with another doubleheader Monday, and the rest of the regular rotation is currently healthy.

September 12, 2020 02:40 PM
Athletics' Daulton Jefferies: Officially serving as 29th man
by RotoWire Staff | RotoWire

Jefferies was called up by the Athletics as the 29th man ahead of his scheduled start for Game 1 of Saturday's doubleheader.

The move was expected as Jefferies is set to make his major-league debut against the Rangers on Saturday. He'll take the mound for the matinee after preparing at the team's alternate training site to begin the season. The right-hander posted a 3.66 ERA and 72:7 K:BB over 64 innings at the Double-A level last year.

September 11, 2020 04:04 PM
Athletics' Daulton Jefferies: Set for big-league debut Saturday
by RotoWire Staff | RotoWire

Jefferies will be called up from the alternate training site to start one of the games in Saturday's doubleheader against the Rangers, Susan Slusser of the San Francisco Chronicle reports.

The 25-year-old has been at the alternate training site all season preparing for the opportunity, and he'll make his major-league debut Saturday at Texas, though it's unclear which game of the twin bill he'll start. Jefferies spent most of 2019 at Double-A and posted a 3.66 ERA, 1.09 WHIP and 72:7 K:BB across 64 innings.

August 7, 2020 02:28 PM
Athletics' Daulton Jefferies: Awaiting chance at alternate site
by RotoWire Staff | RotoWire

Jefferies is on the top of the depth chart if Oakland needs to promote a starting pitcher from the alternate training site, Susan Slusser and Matt Kawahara of the San Francisco Chronicle report.

He missed time in spring training 1.0 with a biceps issue, but it sounds like he is good to go and awaiting his chance at the alternate site. Jefferies apparently impressed this spring when healthy and logged a 93:9 K:BB in 79 innings last year, primarily at Double-A -- his first full season since 2017 Tommy John surgery.

March 7, 2020 01:32 AM
Athletics' Daulton Jefferies: Optioned to Triple-A
by RotoWire Staff | RotoWire

Jefferies (biceps) was optioned to Triple-A Las Vegas on Friday, Chris Haft of reports.

The move comes as no surprise, as Jefferies was expected to start the season with Las Vegas and has also been sidelined with a biceps strain that short-circuited his opportunity to get further seasoning in big-league camp. The 24-year-old's status will certainly be one to monitor, as a 2019 campaign that was good enough earn him the organization's Minor League Pitcher of the Year award has led to expectations that the talented right-hander could eventually reach the big leagues at some point in 2020.

March 2, 2020 06:16 PM
Athletics' Daulton Jefferies: Specialist confirms stained biceps
by RotoWire Staff | RotoWire

Doctors confirmed Jefferies is dealing with a right biceps strain, Shayna Rubin of The San Jose Mercury News reports.

A specialist confirmed Jefferies avoided damage to his elbow, which is good news for the 24-year-old, who underwent Tommy John surgery back in April of 2017. While the right-hander seemingly dodged a bullet, a biceps strain could still be problematic for a pitcher, and the Athletics will likely handle him with extra caution, leaving his status for the start of the season in doubt.

March 1, 2020 02:28 PM
Athletics' Daulton Jefferies: Visiting specialist Monday
by RotoWire Staff | RotoWire

Jefferies (biceps) underwent an MRI which revealed no elbow issues, but he'll visit a specialist Monday for his upper biceps strain, Martin Gallegos of reports.

Jefferies left last Monday's spring game with the injury and continues to be evaluated, so he won't have a recovery timeline until after his visit with the specialist. Manager Bob Melvin previously indicated the team "dodged a bullet" with the initial diagnosis, but a biceps strain could still be problematic for a pitcher. The 24-year-old's status for the start of the season remains up in the air for now.

February 26, 2020 02:24 PM
Athletics' Daulton Jefferies: Heading for MRI
by RotoWire Staff | RotoWire

Jefferies has been diagnosed with a biceps strain and will undergo an MRI on Thursday, Susan Slusser of the San Francisco Chronicle reports.

Manager Bob Melvin says the Athletics "dodged a bullet" with Jefferies' injury, though it's not as if a biceps strain is a total non-issue for a pitcher. His expected recovery timeline won't become clear until after the MRI.

February 24, 2020 06:48 PM
Athletics' Daulton Jefferies: Dealing with biceps issue
by RotoWire Staff | RotoWire

Manager Bob Melvin said Jefferies was removed from Monday's Cactus League game against the Brewers with a biceps issue, Susan Slusser of the San Francisco Chronicle reports.

Melvin didn't elaborate on the injury, which prompted Jefferies to exit Monday's spring game with a trainer after recording just two outs. Prior to his removal, the right-hander allowed three runs on three hits and a walk.

February 24, 2020 04:40 PM
Athletics' Daulton Jefferies: Exits with trainer
by RotoWire Staff | RotoWire

Jefferies exited Monday's Cactus League game against the Brewers with a trainer, Shayna Rubin of The San Jose Mercury News reports.

Jefferies left the field with a trainer after allowing three runs on three hits and a walk while recording just two outs. The reason behind his removal is not yet known.

February 16, 2020 10:56 AM
Athletics' Daulton Jefferies: Impressing early in camp
by RotoWire Staff | RotoWire

Jefferies, Oakland's Minor League Pitcher of the Year in 2019, has impressed during his first two bullpen sessions in camp, Martin Gallegos of reports. "His walk numbers are off the charts," A's manager Bob Melvin said. "He looks good. He's poised and has a really good delivery. Very rarely does he miss a spot, and at a young age, that's something that seems to come pretty easy for him."

The 24-year-old earned the aforementioned distinction with an eye-popping 93:9 K:BB across 79 innings with High-A Stockton and Double-A Midland, and that pinpoint control has been on display thus far in big-league camp. Jeffries already boasts a mid-90s fastball and a changeup that sits in the high 80s, and one of his goals this spring is to further develop a slider he began throwing midway through last season. Gallegos reports Jefferies is highly likely to start the season at Triple-A Las Vegas regardless of how his spring training unfolds, but he won't be on the same innings restrictions that were necessary in 2019 when he came back from Tommy John surgery.

November 20, 2019 04:12 PM
Athletics' Daulton Jefferies: Contract selected by Oakland
by RotoWire Staff | RotoWire

Jefferies was added to the Athletics' 40-man roster Wednesday.

The 24-year-old's addition to the 40-man roster protects him from the Rule 5 draft after he recorded a 3.66 ERA with a 72:7 K:BB over 64 innings with Double-A Midland last season. Right-hander Jharel Cotton was designated for assignment in a corresponding move. Although Jefferies was effective at the Double-A level in 2019, he'll likely need more time against better minor-league competition before making his major-league debut.

September 3, 2019 06:48 PM
Athletics' Daulton Jefferies: Reaches innings limit
by RotoWire Staff | RotoWire

Jefferies will finish the season on the 7-day injured list with Double-A Midland after reaching his innings limit, Melissa Lockard of The Athletic reports. "His last game was his highest velo game of the year," Midland pitching coach Steve Connelly said. "He basically sat 95. It was really good to see. We all got together and talked it out. He's at his innings limit. We could try to push it or we could say, 'Congratulations, great year and next year you'll be ready to go hopefully into late October.'"

The 6-foot righty logged just 20.1 pro innings between 2016 and 2018 due to April 2017 Tommy John surgery, so this was an excellent first full year back. He logged a 3.42 ERA, 1.04 WHIP and 93:9 K:BB in 79 innings, primarily at the Double-A level. The A's were very careful with him -- he threw between three and 3.2 innings in all 26 appearances -- so his numbers are a little inflated due to the fact he never had to turn a lineup over more than twice. Still, Jefferies has a plus changeup, a potentially plus fastball, and plus control. He should head to Triple-A at the start of the 2020 season, but if all goes well Jefferies will spend a good chunk of next season pitching in the big-league rotation.

June 4, 2019 01:48 PM
Athletics' Daulton Jefferies: Impressing at Double-A level
by RotoWire Staff | RotoWire

Jefferies is 0-1 with a 2.57 ERA, 0.90 WHIP and 18:0 K:BB across 21 innings over seven appearances (five starts) with Double-A Midland.

Jefferies received a promotion from High-A Stockton in late April and made his first appearance with Midland back on May 1. He's had minimal trouble finding his footing against the higher level of competition while operating as both reliever and starter thus far. The right-hander has yet to throw more than three innings in any appearance, but he's making nice progress up the organizational ladder, now more than two years removed from April 2017 Tommy John surgery.

April 4, 2019 06:00 PM
Athletics' Daulton Jefferies: Healthy at High-A
by RotoWire Staff | RotoWire

Jefferies is listed as healthy to start the season for High-A Stockton, Jonathan Mayo of reports.

We want to knock on wood with this news, as Jefferies was starting to look like a cautionary tale for Tommy John surgery. He underwent the procedure in April of 2017 and has thrown exactly two innings in a game since then. Now, a little less than 24 months removed from the procedure, the 6-foot righty will look to make up for lost time. He has No. 2 starter upside, but significant durability concerns and lost developmental time make that a very unlikely outcome at this point.

June 14, 2018 03:28 PM
Athletics' Daulton Jefferies: Velocity in mid-90s, rehab start on tap
by RotoWire Staff | RotoWire

Jeffries (elbow) is back to throwing 95 mph off a mound and will make his first rehab start in an Arizona League game next week, Susan Slusser of the San Francisco Chronicle reports.

Jefferies had Tommy John surgery last year, and the rehab start would represent his first taste of game action since April 13, 2017. The 22-year-old right-hander was only able to log two appearances (one start) at the High-A level before his injury, generating a 2.57 ERA and 1.14 WHIP over seven innings.

April 7, 2018 11:04 AM
Athletics' Daulton Jefferies: On pace for midseason return
by RotoWire Staff | RotoWire

Jefferies (elbow) could join the rotation at High-A Stockton by midseason,'s Mike Rosenbaum reports.

This is excellent news for the promising right-hander, as it sounds like his rehab from April 2017 Tommy John surgery is going as planned. He logged seven innings at High-A last season before getting hurt, so he may spend the whole 2018 season there once he's healthy. Jefferies has mid-rotation upside, but staying healthy and building up his workload will be imperative if he is to make it as a starter.

Last 7 Games
09/12@ TEXL 2-512.05521
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Pitching Stats
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Minor League Pitching Stats
2016R-AZL Athletics 11.1550000172112.431.171
2017AFA-Stockton Ports 7.02100006172.571.143
2018ROK-AZL Athletics 2.01100005010.000.500
2019AFA-Stockton Ports 15.0530100212102.400.800
2019AAX-Midland RockHounds 64.021120120727633.661.094

Player Info

Merced, CA
Oakland Athletics
MLB Experience: