Olivero is a 27-year-old and was born in the Dominican Republic. The pitcher’s professional baseball journey in 2015, when he Olivero is a 28-year-old right-hander from the Dominican Republic. His professional baseball journey began in 2016 when he signed as an international free agent with the Arizona Diamondbacks. In 2019, he earned Northwest League Pitcher of the Year honors with the Hillsboro Hops after posting a 2.09 ERA in 15 games. Olivero joined the RailCats in 2024 for just three appearances before his contract was transferred to Tigres de Quintana Roo. He returned to the RailCats in 2025 and delivered a solid season, finishing with a 3.65 ERA in 17 starts. The veteran logged 88.2 innings, striking out 51 while issuing just 27 walks.