Full name is Jonathan Stanley Loaisiga (pronounced "loh-AYE-see-gah").
Went 3-0 with a 3.52 ERA (23.0IP, 9ER) and 22K in 12 games (three starts) with the Yankees, spending the entire season at the Major League level for the first time in his career…made his first Opening Day roster...Served as the Yankees’ “opener” three times, posting a 3.24 ERA (8.1IP, 3ER) without recording a decision… went 3-0 with a 3.68 ERA (14.2IP, 6ER) in nine relief appearances...Was placed on the 10-day injured list on 9/4 (retroactive to 9/2) with a medical condition that prevented him from playing and necessitated placement on the IL…was reinstated on 9/15…missed 13 team games... Allowed a season-high 4R/3ER on 9/21 at Toronto (1.0IP, 5H, 2BB)...Made two postseason relief appearances, posting a 9.00 ERA (2.0IP, 2ER).
Went 2-2 with a 4.55 ERA (31.2IP, 16ER) and 37K in 15 games (four starts) over four stints with the Yankees (4/3-9, 4/23-4/24, 5/8-8/23, 8/31-9/29)...Made four starts (4/3 vs. Detroit, 4/9 at Houston, 5/8 vs. Seattle and 9/25 at Tampa Bay), going 0-2 with a 6.75 ERA (12.0IP, 9ER)..served as the Yankees' opener on 9/25 at Tampa Bay...Earned his first win of the season on 4/24 at Los Angeles-AL, tossing 3.0 scoreless innings of relief (2H, 1BB, 1K)...Was placed on the 10-day injured list on 5/13 (retroactive to 5/10) with a right shoulder strain..was transferred to the 60-day I.L. on 5/14..was returned from rehab and reinstated from the 60-day I.L. on 8/13..combined in three rehab starts with Double-A Trenton and Triple-A Scranton/Wilkes-Barre to allow 3ER in 5.2IP (5H, 1BB, 8K, 1HR, 1HP)...Had 5K on 9/21 vs. Toronto, setting a relief appearance career high..touched 100.0 mph in the outing according to Statcast...Posted a 3.38 ERA (2.2IP, 1ER) in four postseason relief appearances..made his postseason debut in ALDS Game 2 vs. Minnesota, allowing 1ER in 1.0IP (2H, 2K)..became the fifth Nicaragua-born player to appear in a postseason game, joining Dennis Martínez, David Green, Marvin Benard and Vicente Padilla, and the first to do so with the Yankees...Combined with Trenton and Scranton/WB to go 0-2 with a 5.60 ERA (17.2IP, 11ER) in six total appearances (five starts).
Went 2-0 with a 5.11 ERA (24.2IP, 26H, 17R/14ER, 12BB, 33K, 3HR) in nine appearances (four starts) over two stints with the Yankees (6/15-7/2 and 9/2-30)…opponents hit .271 (26-for-96, 3HR); LH .273 (12-for-44, 1HR), RH .269 (14-for-52, 2HR)...Was 2-0 with a 3.00 ERA (18.0IP, 6ER) in four starts…posted a 10.80 ERA (6.2IP, 8ER) without recording a decision in five relief appearances...Became the first Nicaragua-born player in Yankees history and the 15th Nicaraguan player (11th pitcher) in Baseball history...Made his Major League debut on 6/15 vs. Tampa Bay, tossing 5.0 shutout innings (3H, 4BB, 6K) to earn the win…was the 11th pitcher (eighth starter) in Yankees history to toss at least 5.0 scoreless innings in his Major League debut, just the second since 1943 (Sam Militello-7.0IP in a start on 8/9/92 vs. Boston)…was the first Yankees pitcher since 1908 to record at least 6K and not allow a run in his Major League debut…was the first Yankees pitcher to record a win in his first career game since Masahiro Tanaka on 4/4/14 at Toronto…was recalled from Double-A Trenton prior to the game, and per Elias, was the first player to make his Major League debut with the Yankees (excluding Masahiro Tanaka) without having ever appeared at the Triple-A level since INF Ramiro Peña on 4/6/09 at Baltimore…was the first pitcher to do so since LHP Chase Wright on 4/17/07 vs. Cleveland...On 6/25 at Philadelphia, took a no-hitter into the sixth inning and earned his second win (5.1IP, 1H, 0R, 2BB, 8K)…allowed his only hit on a leadoff single by Jorge Alfaro in the sixth…retired the first 12BF in order…became the second Yankees pitcher since 1908 to toss at least 5.0 shutout innings twice within his first three career games, joining Johnny Allen (5/3/32 at Washington-AL, 5/11/32 vs. St. Louis-AL)...Combined with Single-A Tampa, Double-A Trenton and the GCL Yankees West to go 6-1 with a 2.89 ERA (56.0IP, 57H, 18ER, 8BB, 67K) in 14 minor league starts…had two stints on the minor league disabled list...Was named Florida State League "Pitcher of the Week" for 4/5-15 (2-0, 10.0IP, 0R in 2GS)...Made one spring training relief appearance with the Yankees, tossing 1.0 scoreless inning (1HP, 2K)...Following the season, was tabbed by Baseball America as the No. 2 prospect in the Yankees organization…was named by MLB.com as the No. 66 overall prospect.
Combined with the GCL Yankees East, GCL Yankees West and short-season Single-A Staten Island to go 1-1 with a 1.38 ERA (32.2IP, 17H, 7R/5ER, 3BB, 33K, 1HR) in 11 starts... Made his season debut in June with the GCL Yankees East, going 0-1 with a 2.63 ERA (13.2IP, 4ER) in six starts…also made one start with the GCL Yankees West, tossing 2.0 perfect innings... Was promoted to short-season Single-A Staten Island on 8/16, where he went 1-0 with a 0.53 ERA (17.0IP, 1ER) in four starts... Was added to the Yankees' 40-man roster on 11/20/17.
Made one start with Single-A Charleston on 5/13 at Lexington-G2, allowing 2ER in 2.1IP.
Did not pitch... Was released by the Giants on 5/28/15.
Spent the season on the minor league disabled list and did not pitch.
Made his professional debut with the DSL Giants and was 8-1 with a 2.75 ERA (68.2IP, 21ER) in 13 starts.