He was signed as an undrafted free agent by the Houston Astros on August 14,2009,after participating in a tryout camp run by scout Rusty Pendergrass. He was signed for $160,000,with Pendergrass and scout Clarence Johns claiming Alaniz has the "stuff to be a major league starter."[1] He began his professional career the next year. With the Greeneville Astros in 2010,he was 6–4 with a 4.21 ERA and the following year,he was 7–10 with a 4.44 mark for the Lexington Legends. In 2012,Alaniz went 6–2 with a 5.04 ERA for the Lancaster JetHawks and in 2013,he was 9–9 with a 4.53 mark for the Corpus Christi Hooks. He was 1–1 with a 6.64 ERA for the Corpus Christi Hooks in 2014 before being suspended 50 games for using a drug of abuse in late August.[2] It was his second suspension. Alaniz was once rated as having the best curveball in the Astros system and had been named among the club's best prospects.[3] He appeared in major league spring training in 2012.[4] He returned in 2015 to go 6–4 with a 4.55 ERA for the Hooks.[5] he became a free agent following the season
Detroit Tigers
Alaniz signed a minor league contract with the Detroit Tigers organization on December 3,2015.[6] He split the 2016 season between the Erie SeaWolves and the Toledo Mud Hens,accumulating a 4–4 record with a 2.69 ERA in 73 innings.[7] In 2017,he again split the year between Erie and Toledo,accumulating a 3–3 record with a 2.30 ERA in 70+1⁄3 innings.[7] He elected free agency following the season on November 6, 2017.[8]
Tampa Bay Rays
On December 14, 2017, Alaniz signed a minor league contract with the Tampa Bay Rays organization.[7] He split the 2018 season between the rookie–level GCL Rays, the High–A Charlotte Stone Crabs, the Double–A Montgomery Biscuits, and the Triple–A Durham Bulls. He accumulated a 3–4 record with a 3.38 ERA in 42+2⁄3 innings.[7] Alaniz elected free agency following the season on November 2.[9]
On April 12, 2019, he was recalled to the major leagues for the first time.[11] He made his debut that night, allowing four runs over two innings of relief.[12] In 4 games with Seattle, Alaniz struggled to a 20.25 ERA.
Cincinnati Reds
On May 31, 2019, he was claimed off waivers by the Cincinnati Reds and optioned to the Louisville Bats.[13] Alaniz recorded a 5.40 ERA in 8 games with Reds. On December 9, Alaniz was outrighted off the Reds 40-man roster.[14]
On September 15, 2020, Alaniz was selected to the major league roster.[15] Alaniz did not make an appearance for Cincinnati in 2020 and was non-tendered by the Reds on December 2. On December 11, Alaniz re-signed with the Reds on a minor league contract.[16] He was assigned to Louisville to begin the 2021 season and posted a 2.25 ERA in 21 appearances. On July 19, 2021, Alaniz was selected to the active roster.[17] In 3 appearances for the Reds in 2021, Alaniz posted a 3.38 ERA with 3 strikeouts. On September 22, 2021, the Reds designated Alaniz for assignment.[18] On October 6, Alaniz elected free agency.[19]
Atlanta Braves
On January 24, 2022, Alaniz signed with the Acereros de Monclova of the Mexican League for the 2022 season.[20] Prior to the start of the Mexican League season, on March 20, Alaniz signed a minor league contract with the Atlanta Braves organization.[21] In 20 games for the Triple-A Gwinnett Stripers, Alaniz logged a 3–1 record and 3.81 ERA with 41 strikeouts in 26.0 innings of work. He elected free agency on November 10.[22]
Acereros de Monclova
On February 3, 2023, Alaniz signed with the Acereros de Monclova of the Mexican League.[23] In 23 relief outings, he posted a 4.01 ERA with 20 strikeouts and one save across 24+2⁄3 innings of work.[24]
Alaniz made 35 appearances for Monclova in 2024, posting a 4–3 record and 2.31 ERA with 39 strikeouts and 10 saves across 35 innings of relief.
Alaniz re-signed with Monclova for the 2025 season his third with the team. He finished the season having appeared in 28 relief appearances, posting a 3–0 record and 4.05 ERA with 41 strikeouts and 12 saves.
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