Andres Diaz is a right-handed pitcher from Venezuela. The Kansas City Royals would sign the hurler as an international free agent when he was 16 years old. In his first season of professional baseball, Diaz pitched 12 games in relief and posted a 3.38 ERA. The 24 year old would go on to pitch five seasons in the Royals minor league system and had a 3.38 ERA in 61 games, Diaz showed great control with 149 strikeouts and just 26 walks.  

In 2024, Diaz signed his first contract with the RailCats. He would initially begin the season out of the bullpen, but after the departure of Deyni Olivero to Mexico, Diaz would be plugged into the rotation. In his second start he would pitch seven scoreless innings and win the Pitcher of the Week award.  

Diaz pitched for the RailCats again in 2025, making 18 starts for Gary and had a 4.89 ERA, threw two complete games, and struck out a career-high 79 batters. In the month of July, Diaz pitched five starts, turned in a 3.18 ERA, and held opposing batters to a .221 batting average.