Sandy Alcántara Montero was born on September 7, 1995, in San Juan de la Maguana, Dominican Republic. He is a pitcher in the MLB.
He is one of 11 children. When he was 11 years old, his parents sent him to live with an older sister in the capital, Santo Domingo, where he could both study for school and attend baseball practice. He dropped out of school in eighth grade to concentrate on a baseball career.
In July 2013, at age 16, Alcántara signed with the St. Louis Cardinals as an international free agent. He made his professional debut in 2014 with the Dominican Summer League Cardinals and spent the whole season there, going 1-9 with a 3.97 ERA in 12 games (11 starts). He spent 2015 with the Gulf Coast Cardinals where he pitched to a 4-4 record and 3.22 ERA in 12 games started, and started 2016 with the Peoria Chiefs. During a start in May he tied the Chiefs record with 14 strikeouts. He was promoted to the Palm Beach Cardinals in July 2016. He finished the 2016 season with a combined 5-11 record with a 3.96 ERA in 23 games started between both clubs.
Alcántara began 2017 with the Springfield Cardinals. After pitching to a 7-5 record and 4.31 ERA in a career high 125.1 innings, the Cardinals promoted him to the major leagues on September 1, 2017. After the season, the Cardinals assigned Alcántara to the Surprise Saguaros of the Arizona Fall League (AFL), where he was selected to the Fall Stars Game. He pitched 15 total innings in the AFL, finishing the season with five games started, a 1-2 record, and a 4.20 ERA.
On December 14, 2017, the Cardinals traded Alcántara, along with Magneuris Sierra, Zac Gallen, and Daniel Castano, to the Miami Marlins for Marcell Ozuna. MLB.com ranked Alcántara as Miami's third best prospect going into the 2018 season. He began 2018 with the New Orleans Baby Cakes, and was recalled by Miami on June 28. He made his Marlins debut on June 29 as the starting pitcher, pitching five innings in which he gave up one run on three hits and five walks while striking out two, earning the win as Miami defeated the New York Mets 8-2. He was placed on the 10-day disabled list on with a right axillary infection. On May 19, 2019 Alcantara pitched an 89 pitch two-hit Maddux against the New York Mets.
He was the sole Miami Marlins player named to the 2019 Major League Baseball All-Star Game.
Alcántara owns Marlins franchise records of most innings pitched by a rookie, and most innings pitched and strikeouts by a Dominican-born player. On November 28, 2021, the Marlins signed Alcantara to a contract extension worth $56 million, breaking the record for the largest contract for a pitcher under team control with less than four years service time set by Carlos Martinez.
In 2022, he was 14–9 with a 2.28 ERA in 32 starts covering 228.2 innings. With a bWAR of 8.0, Alcántara led the National League, and led all pitchers across both leagues. He unanimously won the 2022 NL Cy Young Award, over second-place pitcher Max Fried.