Began his 2019 campaign in Amarillo (AA) where he went 0-4 with a 4.25 ERA (17 ER, 36.0 IP) in a career-high 16 starts with a .215 opponent AVG, 44 SO and 15 BB...The 20-year-old left-hander had his contract selected on July 21 and made his ML debut in a start against CHC at Wrigley Field that same day…allowed just 1 run (earned) on 3 hits in 2.1 IP with 1 SO…did not factor in the decision in what would eventually be a Padres' 5-1 win...Became the 3rd player from the 2016 International Signing Class to make his ML debut, behind only RHP Elvis Luciano and INF/OF Lourdes Gurriel Jr. of the Toronto Blue Jays...at 20 years, 144 days old, he became the second-youngest Padre to making his pitching debut, behind only Jay Franklin at 18 years, 172 days old on September 4, 1971...At the time of his debut, Morejon was the 3rd-best pitching prospect in the Padres system (No. 4 overall) by MLB.com and No. 48 among all ML prospects...listed as an Honorable Mention in Keith Law's midseason Top 50 prospects update during the All-Star break and entered 2019 rated as the No. 46 overall prospect by ESPN. com, No. 49 by MLB.com and No. 52 overall by Baseball America...Made his 1st ML relief appearance on July 25 at NYM, tossing 1.0 scoreless inning with 1 hit allowed and 1 SO... went on to make 2 more relief appearances in 2019...Made his 2nd-career start and his Petco Park debut on July 28 vs. SF (1.2 IP), 2 ER, 2 H, 3 BB) but did not factor into SD's 7-6 loss...4 of his 5 ML appearances were on the road (6.1 IP)...Posted a 6.75 ERA with a .294 opponent AVG in 4.0 IP as a starter and a 13.50 ERA with a .455 opponent AVG in 4.0 IP as a reliever...Placed on the 10-Day IL on August 8 with a left shoulder impingement…was transferred to the 60-Day IL on Sept. 16 and missed the remainder of the season.
Spent the majority of the season with Lake Elsinore (A), going 4-4 in 13 appearances (all starts) with the Storm and posting a 3.30 ERA (23 ER, 62.2 IP)...Made 2 stints on the 7-day DL, making 1 rehab start with AZL Padres 1 (R), working 2.2 IP and fanning 4...His 74 SO, 3.44 ERA and 65.1 IP between AZL 1 and LE set career highs in a single season.
Split his first professional campaign between Tri-City (A) and Fort Wayne (A), making 13 appearances (all starts) while posting a 3.86 ERA (27 ER, 63.0 IP)...Began the season with TC, logging 35 SO against 3 BB in 35.1 innings of work for the Dust Devils...Made his first postseason appearance with FW, starting 2 games with a 8.22 ERA (7 ER, 7.2 IP) with 5 BB and 7 SO.