Boston Red Sox The
Boston Red Sox signed Aro as an international free agent on June 6, 2011. He grew up in the Dominican Republic idolizing Red Sox legend and Hall of Famer
Pedro Martínez. His pitching repertoire includes a 91–93 mph
fastball which occasionally reaches 95 mph, as well as an 83–85 mph
changeup and a
slurve at 78–81 mph with a short,
11-to-5 break, throwing most of them for strikes. Aro made a fast ascent in the Boston Minor League system in a span of four years. After spending a full season each with the
Dominican Summer League Red Sox,
Gulf Coast League Red Sox, and
Lowell Spinners from 2011 through 2013, he spent 2014 with the
Salem Red Sox and the
Greenville Drive. Besides, he was named a SoxProspects.com All-Star in both 2013 and 2014, and was also honored as
South Atlantic League All-Star in the 2014 season, after finishing with a record of 1–3 and a 2.16
ERA and 10
saves in 25 games, including 74
strikeouts and 22
walks in
innings pitched. Aro joined the
Portland Sea Dogs bullpen in 2015, where he posted a 3–2 record with a 2.28 ERA in eight appearances, striking out 19 and walking eight in innings. He then appeared in his fourth level in less than ten months, after being promoted to the
Pawtucket Red Sox in May 2015. He was optioned July 2 after three appearances, then was recalled in September, making six total appearances with Boston for the season while recording an 0–1 record with 6.97 ERA. Aro was also the recipient of the Red Sox'
Lou Gorman Award.
Seattle Mariners On December 7, 2015, the Red Sox traded Aro and
Wade Miley to the
Seattle Mariners for
Roenis Elías and
Carson Smith. On January 26, 2017, Aro was designated for assignment by the Mariners. After clearing waivers, Aro was outrighted to the Triple-A
Tacoma Rainiers on February 1. On April 24, Aro was suspended 50 games by MLB for a drug of abuse. In 25 appearances for Tacoma, he posted a 6–1 record and 3.16 ERA with 48 strikeouts across innings pitched. Aro elected free agency following the season on November 6.
San Diego Padres On November 27, 2017, Aro signed a minor league contract with the
San Diego Padres. In 38 relief outings for the Triple–A
El Paso Chihuahuas, he recorded a 3.68 ERA with 36 strikeouts across 44 innings pitched. Aro elected free agency following the season on November 2, 2018.
Atlanta Braves On January 18, 2019, Aro signed a minor league contract with the
Atlanta Braves. He made 31 appearances split between the Double–A
Mississippi Braves and Triple–A
Gwinnett Stripers, accumulating a 6–3 record and 3.53 ERA with 40 strikeouts across innings pitched. Aro elected free agency following the season on November 4.
Guerreros de Oaxaca On January 29, 2020, Aro signed with the
Guerreros de Oaxaca of the
Mexican League. Aro did not play in a game in 2020 due to the cancellation of the Mexican League season because of the
COVID-19 pandemic. He was released by the Guerreros on November 18. On March 5, 2021, Aro re-signed with Oaxaca. Aro registered a 11.72 ERA with 5 strikeouts in 7 games for Oaxaca before being released on June 15. Aro made 40 appearances (7 starts) for the Triple-A
Salt Lake Bees, working to a 4–7 record and 6.03 ERA with 51 strikeouts and 3 saves in innings pitched. He elected free agency following the season on November 10.
Mariachis de Guadalajara (second stint) On February 21, 2023, Aro signed with the
Mariachis de Guadalajara of the
Mexican League. In 46 appearances for Guadalajara, he posted a 4–2 record and 2.51 ERA with 44 strikeouts and 15 saves across innings of relief.
Charros de Jalisco On February 14, 2024, Aro signed with the
Charros de Jalisco of the
Mexican League. He made 17 appearances for Jalisco, struggling to an 0–3 record and 8.10 ERA with 13 strikeouts and 6 saves over innings pitched. Aro made 11 appearances for Jalisco in 2025, but struggled to a 9.22 ERA with nine strikeouts across innings pitched.
Guerreros de Oaxaca (second stint) On June 1, 2025, Aro was traded to the
Guerreros de Oaxaca of the
Mexican League. In 11 appearances for Oaxaca, he struggled to a 0-1 record and 13.50 ERA with six strikeouts over eight innings of work. Aro elected free agency on July 2.
El Águila de Veracruz On July 3, 2025, Aro signed with
El Águila de Veracruz of the
Mexican League. In 17 games he threw 17 innings of relief going 0-0 with a 1.06 ERA and 15 strikeouts. ==References==