Aaron is in his second season in the Cubs organization after being acquired from Oakland for OF Chris Coghlan, February 25, 2016 ... spent all of last season on the major league disabled list with a hip contusion ... has appeared in 15 major league games with the Royals (2014-15) and Athletics (2015), making 10 starts...Has gone 3-5 with a 8.38 ERA (54 ER/58.0 IP) in 15 major league games, striking out 40 and walking 17...Has gone 44-33 with a 4.26 ERA (316 ER/667.1 IP) in 118 minor league games, including 112 starts, over six minor league campaigns ... has walked just 106 batters, while fanning 515...Was named Pitcher of the Year at Triple-A Omaha in 2014 and also earned PCL Postseason MVP honors after tossing a two-hit shutout to clinch the PCL title ... earned Northwest Arkansas Pitcher of the Year honors in 2013 and was a Pioneer League All-Star in 2011...Originally drafted by Kansas City in the ninth round of the 2011 Draft ... was traded to Oakland July 28, 2015 with P Sean Manaea for IF Ben Zobrist and cash...Attended Cal State San Bernardino where he was named California College Athletic Association Freshman of the Year in 2009 ... set the school's career record for innings pitched...Graduated from Cajon High School in San Bernardino, Calif. in 2008 ... set school records in home runs and career wins.
Aaron missed nearly the entire season with a right hip contusion ... was originally placed on the 15-day disabled list, March 25...Was sent on a rehab assignment to Triple-A Iowa, June 11, appearing in five games (four starts) ... he posted a 7.71 ERA (14 ER/16.1 IP) with 12 strikeouts from June 11-July 4 ... was transferred to the 60-day disabled list August 19 for the remainder of the season.
Began the season in the Kansas City organization and posted a 6.23 ERA in two relief appearances over four stints with the Royals … was traded to the A's with minor league pitcher Sean Manaea on July 28 for Ben Zobrist and cash considerations, and went 3-4 with a 6.71 ERA in 11 games, including nine starts, with the A's. Tossed five quality starts with the Athletics, including collecting his first major league win, August 1 vs. Cleveland ... allowed just five hits and one run in a career-high 7.1 innings in Oakland's 5-1 triumph ... also tossed 7.0 innings in his next start, August 6 vs. Houston. Went 1-1 with a 4.32 ERA (8 ER/16.2 IP) over his final three outings (two starts) of the season with Oakland. Spent majority of the season with Triple-A Omaha in the Royals organization, appearing in 18 games (17 starts) ... went 6-5 with a complete game and a 3.71 ERA (44 ER/106.2 IP) ... struck out 92 batters and walked 21. Between Omaha and Triple-A Nashville (Oakland) went 7-5 with a 3.56 ERA (47 ER/118.2 IP) in 20 games, including 19 starts. In the minors issued just 21 walks in 118.2 innings, an average of 1.59 walks per nine innings … allowed a .275 opponents batting average, including .254 (54-for-213) against left-handed hitters compared to .294 (73-for-248) against right-handers. Went 4-1 with a 2.95 ERA over a seven-start span with Triple-A Omaha following a one-day stint with the Royals April 26. At the time of the July 28 trade to the A's, he ranked fourth in the Pacific Coast League in strikeouts (92) and tied for eighth in innings pitched (106.2).
Aaron had two stints with the Royals, but pitched a majority of the season at Triple-A Omaha...Made his Major League debut on May 3, pitching 2.0 innings of relief vs. Detroit…He also made his first Major League start May 31 at Toronto, taking the loss after tossing the first 2/3 of an inning...Tabbed Omaha Pitcher of the Year, tying for second in the Pacific Coast League with 12 victories and ranking seventh in ERA (3.88) and 14th in innings pitched (139.0)...Tossed a two-hit shutout in the Pacific Coast League Championship-clinching game, defeating Reno, 4-0...Named PCL Postseason MVP, going 3-0 with an 0.75 ERA (2 ER in 24.0 IP) with three walks and 24 strikeouts in three playoff starts...Posted a 5-0 record and a 3.66 ERA over his final six starts of the year…he also went 4-0 with a 2.13 ERA (6 ER in 25.1 IP) over five starts in May.
Named Northwest Arkansas (AA) Pitcher of the Year after splitting the season between the Naturals and Wilmington (A-Advanced)...promoted to Double-A on June 1...Tossed one of only six 9.0-inning shutouts in the Texas League, blanking Arkansas (7-0) on July 24...named league's Pitcher of the Week on July 29...Allowed just 11 walks in 103.2 innings with the Naturals (0.95 BB/9 IP), fewest in the Texas League among hurlers that recorded at least 100.0 innings.
Ranked among Midwest League leaders in innings (fourth) and strikeouts (fifth) in 2012.
In 2011, earned Pioneer League All-Star honors...finished second in the league in ERA and innings, tied for fourth
in wins and tied for eighth in strikeouts.