Jhonathan Díaz

Jhonathan Alexander Díaz (born September 13, 1996) is a Venezuelan professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB). He has previously played in MLB for the Los Angeles Angels. Díaz signed with the Boston Red Sox as an international free agent in 2013.

Boston Red Sox
Díaz signed with the Boston Red Sox as an international free agent on August 9, 2013, for a $600,000 signing bonus. He spent his professional debut season of 2014 with the Dominican Summer League Red Sox, going 6–2 with a 1.63 ERA over $66 1/3$ innings. He did not play in 2015. He spent the 2016 season with the GCL Red Sox, going 4–4 with a 2.85 ERA with 57 strikeouts over 60 innings. Díaz spent the 2017 season with the Greenville Drive, going 6–6 with a 4.57 ERA with 80 strikeouts over $88 2/3$ innings.

He split the 2018 season between Greenville and the Salem Red Sox, going a combined 11–9 with a 3.09 ERA with 151 strikeouts over $157 1/3$ innings. Díaz spent the 2019 season back with Salem, going 9–8 with a 3.86 ERA and 118 strikeouts over $128 1/3$ innings. He played for the Peoria Javelinas of the Arizona Fall League following the 2019 season. Díaz did not play in 2020 due to the cancellation of the Minor League Baseball season because of the COVID-19 pandemic.

Los Angeles Angels
On November 17, 2020, Díaz signed a minor league contract with the Los Angeles Angels. He split the 2021 minor league season between the Rocket City Trash Pandas and the Salt Lake Bees, going a combined 5–6 with a 4.01 ERA and 92 strikeouts over $76 1/3$ innings.

On September 17, 2021, Díaz contract was selected to the 40-man roster and he was promoted to the major leagues for the first time. He made his MLB debut that night versus the Oakland Athletics. In 3 appearances during his debut campaign, he allowed 6 runs on 11 hits with 9 strikeouts in 13.0 innings pitched.

In 2022, Díaz spent the majority of the season in Triple–A with Salt Lake. In 4 games (3 starts) for the Angels, he recorded a 2.93 ERA with 11 strikeouts across $15 1⁄3$ innings of work. On November 18, 2022, Díaz was designated for assignment by the Angels; he was non–tendered by the team the same day, and became a free agent.

On December 15, 2022, Díaz re–signed with the Angels on a minor league contract. In 38 appearances for Triple–A Salt Lake, he registered a 9–2 record and 4.55 ERA with 79 strikeouts in 87.0 innings of work. On September 7, 2023, the Angels selected Díaz's contract, adding him to the major league roster. In 4 appearances for the team, he struggled to a 10.29 ERA with 4 strikeouts in 7.0 innings of work. Following the season on October 16, Díaz was removed from the 40–man roster and sent outright to Triple–A Salt Lake. He elected free agency following the season on November 6.

Seattle Mariners
On January 9, 2024, Díaz signed a minor league contract with the Seattle Mariners. On May 22, the Mariners added Díaz to their 40–man roster and optioned him back to the Triple–A Tacoma Rainiers. The transaction was performed to prevent Díaz from exercising the opt–out clause in his contract. On June 11, Díaz got the call up and is making his season debut via an emergency start.