Zachary Garrett Jackson…graduated from Berryhill (Okla.) High School…went on to play three seasons at the University of Arkansas…in his sophomore year (2015), went 5-1 with a 2.10 ERA and 89 strikeouts in 60.0 innings…was named to the Southeastern Conference All-Conference Team.
Was a non-roster invitee during the spring and spent the entire season with the A’s before going on the injured list at the end of August with an inflamed right shoulder…went 2-3 with three saves, a 3.00 ERA and .547 opponents OPS in 54 relief appearances in his Major League debut...Ranked second in the American League with 26 holds…was 10th among AL rookies in games pitched...Allowed a .171 opponents batting average but issued 33 walks for a .315 opponents on-base percentage…the walks tied for sixth among AL relievers…surrendered just one home run and had a .232 opponents slugging percentage...Struck out 67 batters in 48.0 innings, an average of 12.56 per nine innings...Based on a minimum of 40 innings pitched, he had the fourth-highest average of strikeouts per nine innings in Oakland history, the seventh-fewest home runs per nine innings and the ninth-highest walks per nine innings (6.19)...First batters faced were 8-for-43 (.186) but he walked nine and hit one for a .337 on-base percentage…the first batter walks tied for fourth most in the AL...Was 3-for-6 (50.0%) in save opportunities…allowed 3-of-16 (18.8%) inherited runners to score...His opponents batting average broke down to .143 (9-for-63) with a .547 OPS against left-handed hitters compared to .188 (19-for-101) with a .546 OPS against right-handers...Had a .131 opponents average with the bases empty, .212 with runners on…yielded a .231 average with runners in scoring position...Compiled a 2.16 ERA in 27 games on the road and stranded all eight of his inherited runners… had a 3.91 ERA in 27 home games but did not allow a home run in 23.0 innings...Posted a 2.16 ERA in 29 games at night, a 3.91 ERA in 25 games during the day...Had a 5.40 ERA in 12 games on no days rest, a 2.43 ERA in 41 games on one day of rest or more...Logged a 5.14 ERA in the ninth inning, a 1.54 ERA in all other innings...Allowed a .117 batting average with two strikes...Tossed fewer than one inning in 20 of his 54 appearances...DAY-BY-DAY: Made his Major League debut in the second game of the season on April 9 at Philadelphia and tossed a scoreless eighth inning…walked the first batter he faced (Hoskins) but then got Jean Segura to ground into a double play and fanned Didi Gregorious for his first career strikeout…allowed a career-high two hits in his second game April 11 at Tampa Bay, his first of six games with two hits…earned his first career save April 19 against Baltimore when he recorded the final out in the A’s 2-1 win…had a 5.40 ERA and .935 opponents OPS over his first seven games through April 21…then did not allow an earned run in 12 of his next 13 games from April 24 to May 24…had a 1.84 ERA, .128 opponents batting average and .408 OPS over that stretch…tossed a career-high 2.0 scoreless innings April 24 against Baltimore… struck out a career-high three batters April 30 against Cleveland…first batters faced were 1-for-15 over a 22-game stretch from May 4 to July 1 but he issued seven first-batter walks over that span…allowed a career-high three runs in 0.2 innings against Tampa Bay on May 4 and took the loss in a 3-0 decision…was credited with his first ML win May 17 against Minnesota when he logged 1.1 scoreless innings in the A’s 5-2 victory…tossed a career-high 34 pitches…yielded six runs in eight innings over a 10-game span from May 25 to June 23 (6.75 ERA)… walked all four batters he faced May 31 against Houston to become the first pitcher in Athletics history to face at least four batters in a game and walk each batter…the four walks were a career high…walked 11 batters in 12.1 innings in May…matched his career high with three strikeouts June 7 at Atlanta…did not allow an earned run over a 14-game stretch from June 25 to July 29 (12.1 ip, 4 h, 1 r, 5 bb, 16 so)…that included a career-high 6.0 inning scoreless streak from June 25 to July 9…opponents were 2-for-25 (.080) with no extra base hits against him in June but he walked seven for a .281 on-base percentage…then posted a 0.84 ERA, .135 opponents batting average and .436 opponents OPS in 13 games in July… allowed his first and only home run of the season on Aug. 4 at Los Angeles (AL), snapping a career-opening 46-game, 41.1-inning, 172-batter faced homerless streak…it was the longest career-opening homerless streak by an A’s pitcher since Brad Ziegler set the Oakland record with a 54.0-inning streak from May 31-Sept. 14, 2008…was placed on the 15-day injured list Aug. 30 retroactive to Aug. 27 with right shoulder inflammation and missed the rest of the season.
Was selected by the A’s in the Triple-A portion of the Rule 5 draft and split his season between Double-A Midland and Triple-A Las Vegas…combined for a 2-2 record, a career-high tying six saves and a 2.57 ERA in 25 relief appearances before a right hip labral tear ended his season in mid-July...Struck out 47 batters in 28.0 innings, an average of 15.11 per nine innings…walked 13 for a strikeout-to-walk ratio of 3.62...Surrendered just two extra base hits (one double, one home run) for a .224 opponents slugging percentage...Allowed a .184 opponents batting average, which broke down to .130 (6-for-46) with a .398 OPS against right-handed hitters compared to .231 (12-for-52) with a .606 OPS against left-handers…did not allow an extra base hit to right-hander...Opponents went 2-for-35 (.057) with runners in scoring position...Was a perfect 6-for-6 in save opportunities and his six saves tied for sixth in the A’s farm system...Allowed 2-of-8 (25.0%) inherited runners to score…first batters faced were 5-for-21 (.238) with three walks and a sacrifice hit...Did not allow an earned run in eight home games with Midland (9.0 ip, 2 h, 1 r, 2 bb, 19 so) but had a 7.94 ERA in six games at home with Las Vegas…posted 2.02 ERA in 11 road games...Compiled a 0.96 ERA in the ninth inning and did not allow an earned run or a hit in extra innings (6.0 ip, 0-for-18)…Allowed a .092 batting average with two strikes...Held the opponents five hitter to a .091 average.
Did not pitch as the minor league season was cancelled due to the pandemic.
Made his Triple-A debut with Buffalo and went 9-0 with a save and a 3.97 ERA in a career-high 46 relief appearances…the wins were a career-high as he had just five over his first three seasons…also had career highs in innings pitched (68.0), hits (56), runs (35), home runs (10) and hit batters (2)…his 3.97 ERA was the highest of his career as was his .225 opponents batting average…tied for seventh among all International League pitchers in wins and tied for eighth in games pitched…tied for third in the Blue Jays farm system in games pitched and tied for seventh in wins…his opponents batting average broke down to .217 against left-handed hitters compared to .229 against right-handers…opponents hit .271 with the bases empty, .165 with runners on… seven of the 10 home runs he allowed were solo shots…allowed 7-of-25 (28.0%) inherited runners to score…first batters faced were 11-for-40 (.275) with six walks (.370 on-base percentage)… compiled a 3.13 ERA and .189 opponents batting average in 24 games on the road, a 4.99 ERA and .265 opponents average in 22 games at home…allowed seven of his 10 home runs at home… held the opponents five hitter to a .042 batting average…tossed at least one inning in 44 of his 46 outings, including two or more 16 times…posted a 0.77 ERA and .14 opponents batting average over a 23-game stretch from May 21-July 27…stranded 16 of his final 17 inherited runners beginning May 29…did not allow an earned run over a 13-game span from June 8-July 17 (22.0 ip)… compiled a 0.48 ERA and .131 opponents batting average in 11 relief appearances in June…struck out a career-high tying five batters in 2.0 scoreless innings on July 14 at Worcester…was placed on the injured list Sept. 1 with a left shin contusion and missed the remainder of the season.
Played the entire season with Double-A New Hampshire and struck out a career-high 75 batters in 62.0 innings…posted a 2.47 ERA for the second consecutive season while recording a career-low .142 opponents’ batting average…also made one postseason appearance (0.1 ip, 1 h, 1 bb)…played for the Surprise Saguaros in the Arizona Fall League and recorded 14 strikeouts over 11.1 innings (4.76 ERA).
Started the season with 15 games for Single-A Lansing…struck out 25 batters over 20.0 innings…was promoted to Single-A Advanced Dunedin for the remainder of the season on June 3…posted a 2.03 ERA and a .171 opponents’ batting average across 27 outings for the D-Jays while striking out 43 batters in 31.0 innings of work…had a win in one postseason appearance (1.2 ip, 2 h, 1 r, 1 er, 1 bb, 1 so).
Played one game for the GCL Blue Jays after signing with Toronto in July of 2016…then joined Short-Season Single-A Vancouver for 13 appearances to close out the season…went 1-1 for the Canadians while recording a .206 opponents batting average and a 3.57 ERA.