Oscar is in his sixth season in the Cubs organization since signing with the club as a non-drafted free agent in October of 2012 ... is ranked as the sixth best prospect in the organization by Baseball America entering 2018... Was the fifth-best prospect by Baseball America entering 2017, and the eighth-best prospect entering 2016... Has gone 20-10 with a 2.83 ERA (80 ER/254.2 IP) in 53-career minor league games, all but four as a starter ... reached the high-A level in 2017 with Myrtle Beach... Was named a mid-season and year-end All Star in 2015 with Single-A Eugene ... has twice earned Pitcher of the Week honors... A native of the Dominican Republic, Oscar made his pro debut in 2013 with the Dominican Summer League Cubs.
Oscar went 4-3 with a 3.46 ERA (21 ER/54.2 IP) in 12 starts with Single-A Myrtle Beach, his first appearance at the high-A level ... also made one rehab appearance with rookie league Mesa, tossing 2.0-scoreless innings... Was placed on the disabled list, May 30, with a chest injury ... was activated, August 24, after a rehab outing with Mesa... Tossed a 7.0-inning complete game shutout, May 14 vs. Lynchburg ... allowed just five hits and walked none... Went 3-0 with a 2.63 ERA (7 ER/24.0 IP) in four May starts prior to his injury.
Limited to just nine games after beginning the season on the disabled list ... made his season debut July 13 ... went a combined 1-3 with a 3.00 ERA (13 ER/39.0 IP) between Mesa, Single-A Eugene and Single-A South Bend... Made six starts with South Bend, going 1-2 with a 3.25 ERA (10 ER/27.2 IP) ... struck out 35 batters while walking eight ... did not allow a homer... Named Midwest League Pitcher of the Week for August 8-14 after tossing 5.0-scoreless innings... Allowed just one earned run in 8.1 innings across two starts with Eugene.
In his first season in the United States, he went 6-3 with a 2.84 ERA (23 ER/73.0 IP) in 13 starts with Single-A Eugene ... earned mid-season and year-end All-Star honors as he tied or set team-highs in wins, innings pitched and strikeouts (73)... Held the opponent to one or zero runs in seven of his 13 outings... Named the Cubs Minor League Pitcher of the Month for August after going 3-1 with a 2.73 ERA (9 ER/29.2 IP) in five starts ... he also earned Northwest League pitcher of the week honors for August 24-30 after striking out a career-high 13 batters in 7.0 innings, August 26 vs. Spokane.
Pitched a career-high 75.0 innings with the DSL Cubs, going 8-1 with a 1.80 ERA (15 ER/75.0 IP) in 14 starts .... allowed one or zero earned runs in each of his first nine starts.
Oscar made his pro debut with the DSL Cubs, appearing in four games, including one start ... went 1-0 with a 6.55 ERA (8 ER/11.0 IP).