Was born in Santo Domingo, Dominican Republic...Grew up in Pedro Band in the Dominican Republic. Played soccer, not trying baseball until he was 15 years old...Really enjoys helping the community where he grew up. Has a foundation called Genesis Mercedes, which is dedicated to helping and developing talent in the sports area...Favorite thing to do on an off day is spend time with family.
Started the season on the 60-day IL due to medical reasons and was reinstated Aug. 9...Was one of the Giants' best relievers, fashioning a 0.49 ERA (1er, 18.1ip) in 19 relief outings...Among MLB relievers w/15.0 IP, only MIL's Devin Williams (0.33 ERA)and OAK's Jake Diekman (0.42) had a lower ERA...Held opposition to a .180 (11-for-61) average against with just two extra-base hits allowed (two doubles)...Right-handed batters hit just .188 (6-for-32) off him while lefties batted .172 (5-for-29)...Three of his six runs allowed came in his final outing of the season on Sept. 27 vs. San Diego.
Posted a 4-2 record with a 3.02 ERA (17er, 50.2ip) and a .216 opponents average over 53 games with Miami... Held opponents scoreless in 45 of his 53 outings overall... Had a 19.0 inning scoreless streak that spanned 18 games from June 19-August 1 (19.0ip)...Went 2-0 with a 1.93 ERA (2er, 9.1ip) over seven games with Triple-A New Orleans.
Spent majority of season with Miami, going 3-3 with 4.91 ERA (66.0 ip/36 er) in 29 games (seven starts), while also making 10 appearances (nine starts) with Triple-A New Orleans, going 2-2 with 4.81 ERA (48.2/26)...Began season in Miami bullpen and made two relief appearances, allowing just two runs over 10.0 innings pitched (1.80 ERA)...Moved to starting rotation on April 11 and made six starts, going 1-1 with 3.55 ERA (33.0/13)...In first career start, April 11 vs. the Mets, tossed 6.0 hitless innings, marking first time in Club history a pitcher tossed 6.0-plus hitless innings in first career start...From first start through fifth inning of second start, retired 38 straight batters without allowing a hit...According to the Elias Sports Bureau, his streak of 10.0 hitless innings to begin his career as a starter tied the Modern Era (since 1900) record, joining Bobo Holloman of the St. Louis Browns in May 1953...Additionally, according to Elias, the hitless streak tied for the second-longest in Marlins history (Armando Benitez-11.0 IP in Aug.-Sept. 2004; Al Leiter-10.0 IP in May 1996; Kevin Brown-10.0 IP in June '97; and Anibal Sanchez-10.0 IP in Sept. '06)...Became first pitcher in Club history to allow four-or-fewer hits and one-or-zero runs in each of first three career starts, according to the Elias Sports Bureau...Allowed five hits combined over first three starts, fewest in Club history and fewest by a lefty in MLB since Tom Fordham in 1997- 98, according to the Elias Sports Bureau...Limited opponents to 10 hits over first four starts, marking fewest hits allowed over a pitcher's first four career starts in Club history. Dating back to 1916, only 10 other pitchers had accomplished that feat, according to Stats LLC...Did not allow a run in first 14.0 innings as a starter... Allowed just two runs over first four career starts, fewest in Marlins history just seventh pitcher overall since 1913, according to Stats LLC... Allowed nine runs over first five starts, tied for third-fewest combined runs over a pitchers' first five starts in Club history...Set new career highs on March 30 vs. the Cubs with 6.0 innings pitched and six strikeouts; was longest relief outing by a Marlins pitcher since Kevin Slowey set Club record with 7.0 innings on June 8, 2013 at the Mets...On April 5 at Philadelphia, became second reliever in Club history to toss 4.0+ innings in consecutive appearances (other, José Ureña in 2017)... Over first six games, including four starts, was 1-0 with 1.09 ERA (33.0/4) and .136 opponents' average...Was placed on 10-day DL on August 24 with right ankle contusion; returned from rehab and reinstated from DL on Sept. 4...Owned 2-0, 2.81 (32.0/10) marks in 13 home game this season, while going 1-3, 6.88 (34.0/26) in 16 road games...As a reliever, was 2-2 with 6.47 ERA (32.0/23) in 22 appearances; went 1-1 with 3.44 ERA (34.0/13) in seven starts.
In first Major League season, led Marlins' bullpen with 68 appearances while posting a 1-2 record and 4.73 ERA (53.1/28). His 68 appearances were tied with Brian Duensing, Mike Dunn, Cory Gearrin, Hunter Strickland, and José Ramírez for 18th in NL... Stranded 34 of 42 inherited runners, marking the seventh-best inherited runner scored percentage (19.0) in the NL. Among rookies, ranked second in the NL and third in Majors, behind Danny Barnes (13.5) and Oliver Drake (16.1)...Limited opponents to .235 (47x200) average against, sixth among NL rookie relievers and 12th among MLB relievers...Started season at Double-A Jacksonville, appearing in three games before being recalled on April 14. Tossed 4.0 scoreless frames with Jumbo Shrimp...Made MLB debut on April 14 vs. Mets, tossing scoreless sixth inning. Walked one and struck out one (Rene Rivera)...Allowed one run over first 10 appearances (9.0 IP), and through an 18-game stretch from May 23-June 29, allowed one earned run over 12.0 innings. Over final 34 games, however, owned 6.33 ERA (27.0/19)...Surrendered first two home runs on May 20 at Dodgers. Gave up just four home runs over remaining 53 games...Tossed career-high 1.2 innings on July 26 at Texas. Equaled high on August 26 vs. San Diego and Aug. 29 at Washington...Placed on 10-day disabled list on Aug. 15 (retro to Aug. 12) with left biceps strain. Reinstated on Aug. 22...Earned first MLB win on Aug. 24 at Philadelphia, becoming 19th Marlins pitcher on season to earn a win.
Made just 17 appearances, 12 starts, after missing significant time with a left triceps strain...Began season at Double-A Jacksonville and went 1-3 with a 4.54 ERA (39.2 ip/20 er) in nine starts prior to going on seven-day disabled list on May 29... Made first start of season on April 8 vs. Birmingham, allowing one run on three hits with a walk and three strikeouts over 4.0 innings...In next start, April 13 at Pensacola, held Blue Wahoos scoreless on just one hit and two walks over 5.2 innings. Struck out season- high six in outing... Following that start, allowed 17 runs (15 earned) over next four outings, going 0-2 with 6.64 ERA (20.1/15)... Earned first win on May 10 at Biloxi, tossing 5.2 scoreless innings, allowing four hits and two walks while striking out four...Made three rehab starts with GCL Marlins, allowing one hit over 4.0 scoreless innings...Upon reinstatement from DL, transferred to Single-A Jupiter. Finished season in Hammerheads bullpen, pitching to 1.29 ERA (7.0/1) in five appearances... Following season, pitched for Mesa Solar Sox in Arizona Fall League. Went 0-1 with 4.97 ERA (12.2/7) in nine appearances... Made 10 appearances for Toros del Este in Dominican Winter League, allowing just one run in 8.0 innings.
Went 4-8 with a 3.57 ERA (133.2 ip/53 er) in 25 combined starts between Single-A Jupiter (18 starts) and Double-A Jacksonville...In second-to-last outing with Jupiter, on July 18 vs. Daytona, tossed a 7.0-inning complete-game shutout, allowing three hits and one walk, with six strikeouts...Over first 10 starts of season, posted 2.10 ERA (51.1 ip/12 er) but only factored in one decision, a 4-1 loss vs. Palm Beach on May 2... Factored in the decision in his next seven starts, going 3-4, 4.48 (38.2/19)...Made Jacksonville debut on July 28 at Mobile, taking loss after allowing six runs (five earned) on eight hits and a walk, with five strikeouts...Allowed two-or-fewer earned runs in his next three starts, and in three-or-fewer in five of his final six starts of the year.