Adam Samuel Oller was originally signed by Pittsburgh scout Phil Huttmann…graduated from Concordia Lutheran (TX) High School before attending Northwestern State (LA) University, where he was named the 2016 Southland Conference Pitcher of the Year as a junior…initially was a reliever in college…was drafted after posting a 1.23 ERA as a starter during his junior season…spent the summer of 2015 with the Falmouth Commodores of the Cape Cod Baseball League and pitched for Sydney in the Australian Baseball League following the 2020 season.
Was one of two players acquired from the New York Mets for Chris Bassitt during the spring and made his Major League debut with the A’s…was on the Opening Day roster and went 2-8 with a 6.30 ERA and .916 opponents OPS in 19 games, 14 starts, over four stints with Oakland... Allowed a .280 opponents batting average and walked 39 batters in 74.1 innings (4.72 per nine innings) for a .366 on-base percentage…yielded 17 home runs for a .549 slugging percentage...Based on a minimum of 70 innings pitched, he had the second-highest ERA, OPS and slugging percentage in the majors and the sixth-highest on-base percentage...His OPS was second highest in Oakland history using the 70 innings minimum (Jim Todd, .936 in 1979)…also had the second-highest slugging percentage (Gil Heredia, .554 in 2001) and ninth-highest ERA…his average of 2.06 home runs per nine innings was third highest...Tied for eighth among American League rookies in games started and ranked 10th in innings pitched…tied for third in most losses and tied for fourth in most home runs...Went 0-3 with a 12.27 ERA and 1.192 OPS in four starts over first two stints (Opening Day April 30 and May 14)…pitched exclusively in relief during his third stint from June 9-29 and logged a 3.24 ERA and .713 OPS in five relief appearances…was recalled for his fourth stint on July 17 and went 2-5 with a 5.08 ERA and .859 OPS over his final ten games, all starts...Was 2-8 with a 6.68 ERA and .940 OPS in 14 starts overall…allowed all 17 of his home runs as a starter…did not allow a home run in 8.1 innings of relief...Did not inherit any runners in relief and first batters faced were 0-for-3 with two walks...His opponents batting average broke down to .262 (32-for-122) with an .899 OPS against left-handed hitters and .292 (50-for-171) with a .927 OPS against right-handers...Yielded a .286 average with the bases empty, .273 with runners on...Allowed 20 of his 55 runs in the second inning for a 14.59 ERA and 1.329 opponents OPS…led the AL and tied for fifth in the majors in most runs in the second inning...Went 0-4 in seven day games, 2-4 in 12 night games...The A’s were 4-10 (.286) in his starting assignments…tossed five innings or fewer in 10 of his 14 starts...Spent the balance of the season with Triple-A Las Vegas where he went 3-0 with a 3.69 ERA and .649 opponents OPS in seven starts...Did not allow a home run in 31.2 innings…struck out 32 batters (9.09 per nine innings) but walked 17 (4.83 per nine innings)...Allowed eight of his 17 runs and 10 of his 29 hits in his one start at home for the Aviators…was 3-0 with a 1.95 ERA and .567 opponents OPS in six starts on the road...Had a .242 opponents batting average, which broke down to .229 (11-for-48) with a .610 OPS against right-handed hitters compared to .250 (18-for-72) with a .675 OPS against lefthanders...Allowed a .203 average with the bases empty, .279 with runners on...Opponents hit .160 the first time through the order but he walked 13 for a .333 on-base percentage…had a .300 opponents batting average and four walks (.347 on-base percentage) after that...Yielded six of his 17 runs in the fifth inning (14.73 ERA)…compiled a 2.33 ERA over innings 1-4...The Aviators were 6-1 (.857) in his starting assignments…allowed one earned run or fewer in five of his seven starts...DAY-BY-DAY: Was on the A’s Opening Day roster and had a no-decision in his Major League debut April 12 at Tampa Bay, a 9-8 A’s loss in 10 innings…became the 54th pitcher in Oakland history to start in his ML debut…tossed 1.1 innings, which was the shortest outing by an A’s starting pitcher in his debut since Glenn Cox logged 1.1 innings for the Kansas City A’s on Sept. 20, 1955…struck out Josh Lowe in the first inning for his first career strikeout…took the loss in his second and third starts on April 17 at Toronto and April 22 against Texas…was 0-2 with an 11.17 ERA in three starts when he was optioned to Las Vegas on May 1…went 1-0 with a 2.25 ERA in two starts with the Aviators before he was recalled by Oakland as the 27th man for the May 14 doubleheader against Los Angeles (AL)…started and lost in a 9-1 decision in the night game, allowing a career-high eight runs in five innings…was sent back to Las Vegas following the game and went 2-0 with a 4.80 ERA in three starts before he was recalled for his third stay with Oakland on June 9…pitched exclusively in relief, logging a 3.24 ERA in five games…made his first relief appearance June 12 at Cleveland, allowing a run on four hits in two innings…tossed two innings in three of his five relief appearances…worked in two of three games at New York (AL) on June 27 (1.1 ip, 2 r, 1 er, 3 bb) and 29 (1.0 ip, 1 bb, 1 so) and was optioned to Las Vegas on June 30…made two final starts with Las Vegas, allowing three runs in 8.2 innings in two no decisions, before returning to Oakland on July 17…spent the remainder of the season with the A’s, going 2-5 with a 5.08 ERA over his final 10 starts…picked up his first Major League win in a 7-5 victory over Houston on July 25 in Oakland, allowing four runs on four hits and two walks in five innings…had gone 0-3 with an 8.56 ERA over the first 10 games of his career…lost each of his next two starts, striking out a career-high six in a 4-1 loss at Chicago (AL) on July 31, and allowing a career-high eight hits in a 7-3 loss to San Francisco on Aug. 6…earned his second and final win of the season Aug. 17 at Texas and then went 0-3 with a 5.40 ERA over his final four starts…had career highs in walks (5) and pitches (111) in a 3-0 loss to Miami on Aug. 22…tossed a career-high eight scoreless innings and allowed just two hits and a walk on Aug. 27 against New York (AL) but had a no decision in the A’s 3-2 win in 11 innings…that extended his scoreless streak to a career-high 11.0 innings…yielded a career-high tying eight hits, including a career-high four home runs, in his next start on Sept. 3 at Baltimore…was placed on the injured list Sept. 6 retroactive to Sept. 4 with right rib costochondritis…did not have a rehab assignment before he was reinstated on Sept. 30…made one final start Oct. 1 at Seattle and allowed three runs in one inning and took the loss.
Was named the New York Mets Organizational Pitcher of the Year and a MiLB.com organizational All-Star after combining for a 9-4 record, a 3.45 ERA and .213 opponents batting average in 23 starts with Double-A Binghamton and Triple-A Syracuse…it was the first time he pitched above Single-A. ...Struck out a career-high 138 batters in 120.0 innings, an average of 10.35 per nine innings… led the Mets farm system in strikeouts…95 of the strikeouts came with Binghamton, which ranked sixth in the Double-A Northeast. ...Also had career highs in wins, starts, innings pitched (120.0) and walks (47) and matched his high in hit batters (8). ...Led the Mets farm system in starts and innings pitched (120.0) and tied for the lead in wins. ...Was 4-3 with a 5.12 ERA, .260 opponents batting average and .740 OPS over his first 12 starts through July 15…then went 5-1 with a 1.89 ERA, .161 opponents average and .514 OPS over his final 11 starts beginning July 23. ...His opponents batting average included a mark of .201 (42-for-209) with a .630 OPS against left-handed hitters compared to .223 (51-for-229) with a .632 OPS against right-handers… surrendered six of his nine home runs to righties…seven of his eight hit batters came against lefties. ...Opponents hit .190 with six home runs with the bases empty, .242 with three home runs with runners on…they were 1-for-10 (.100) with seven strikeouts with the bases loaded. ...Was a combined 3-2 with a 2.91 ERA and .191 opponents batting average in 11 starts in his home ballparks, 6-2 with a 3.92 ERA and .230 opponent average in 12 starts on the road. ...Held the seven, eight and nine hitters in the order to a combined .152 batting average. ...Yielded a .141 batting average with two strikes. ...His teams were 1-9 in his 10 no decisions and had a 10-13 (.435) record in his starting assignments…did not allow a run six times and allowed two runs or fewer in 13 of his 23 starts… allowed four hits or fewer 13 times. ...DAY-BY-DAY: Allowed a season-high five runs and a season-high four walks in a season-low 2.0 innings for the loss in his first start on May 7 at Akron…it was his first of four starts with five runs and his first of six with four walks…yielded a season-high eight hits in a 5-4 loss at Erie on May 23…finished May 0-2 with a 5.18 ERA in five starts…picked up his first win of the season June 4 at New Hampshire (5.0 ip, 5 h, 2 r, 2 er, 3 bb, 4 so)…had a seven-game winning streak from June 30 to Sept. 4…compiled a 1.39 ERA and .180 opponents batting average during the streak…tossed a career-high tying 7.0 innings in a 4-3 win at Altoona on July 15… logged 4.2 scoreless and hitless innings against Erie on July 23 to begin a seven-start stretch where he went 4-0 with a 0.44 ERA and .132 opponents batting average…did not allow a run in five of those starts…had three consecutive starts with 10 or more strikeouts from July 30 to Aug. 14 (35 so in 20.0 ip)…had 10 strikeouts in 6.1 innings on July 30 at Hartford and 12 in a career-high tying 7.0 scoreless innings against Portland on Aug. 5…was promoted to Syracuse on Aug. 9 and fanned a career-high 13 in 6.2 scoreless innings in his first Triple-A start at Worcester on Aug. 14…was 5-3 with a 4.03 ERA in 15 starts with Binghamton at the time of his promotion…finished the season by going 4-1 with a 2.45 ERA in eight starts with Syracuse…had the second lowest opponents batting average (.179) and slugging percentage (.278) in the Triple-A East from Aug. 8 through the end of the season, the third lowest ERA and the fourth lowest OPS (.568)…allowed just one run in four starts in August and was 3-0 wth a 0.38 ERA and .139 opponents batting average…struck out 34 batters in 24.0 innings…went 1-1 with a 4.71 ERA over his final four starts beginning Sept. 10.
Did not pitch following the cancellation of the minor league season due to the pandemic…played for Sydney in the Australian Baseball League following the season and was 1-2 with a 10.24 ERA in three starts.
Signed with Windy City of the independent Frontier League and went 2-1 with a 0.67 ERA in four starts…struck out 45 and walked just two in 27.0 innings…signed a minor league contract with San Francisco on May 30 and spent the entire season at Single-A Augusta…went 5-6 with a 4.02 ERA and .284 opponents batting average in 17 starts…struck out 93 and walked 26 in 87.1 innings and yielded just five home runs…had career highs in losses …was 4-4 with a 3.05 ERA and .230 opponents batting average in 11 starts at home, 1-2 with a 6.39 ERA and .394 opponents average in six starts on the road…went 4-1 with a 1.52 ERA over a five-start stretch from June 24 to July 16…logged a season-high 7.0 scoreless innings in a 5-0 win over Greenville (4 h, 1 bb, so)…struck out a season-high 10 batters in 6.2 innings in his penultimate start of the season on Aug. 25 against Lexington…made one postseason appearance for the Green Jackets and took the loss (2.1 ip, 2 h, 1 r, 1 bb, 5 so).
Combined for a 3-5 record, one save and a 6.29 ERA in a career-high 29 games, including five starts, for Single-A West Virginia and Single-A Bradenton in his final season in the Pittsburgh organization.
Spent the entire season with West Virginia and was 5-3 with a save and 1.59 ERA in 17 games, including two starts…was named to the New York-Penn League Midseason All-Star team…earned NYPL Pitcher of the Week honors for the week of Aug. 28-Sept. 4 after going 1-0 in two games, one start, without allowing a run (7.2 ip, 2 h, 1 bb, 13 so).
Made his professional debut with Rookie Bristol and was 2-2 with two saves and a 4.45 ERA in 13 games, including nine starts.