[1] He made his professional debut with the Dominican Summer League Dodgers in 2015 and spent the whole season there, batting .300 with one home run, 19 RBIs, and eight doubles in 44 games.

He spent 2016 with both the Arizona League Dodgers and the Ogden Raptors where he posted a combined .374 batting average with two home runs, 48 RBIs, a .412 OBP and a .939 OPS in 56 total games between both teams.

[3] The Dodgers selected him as their Minor League Player of the Year for 2017[4] after he hit .316 with eight home runs and 51 RBIs in 101 games between Great Lakes and Rancho Cucamonga.

[5] Ruiz was promoted to the Double-A Tulsa Drillers for the 2018 season and was selected to represent them at the mid-season Texas League All-Star Game.

[5] On July 30, 2021, the Dodgers traded Ruiz, Josiah Gray, Donovan Casey, and Gerardo Carrillo to the Washington Nationals in exchange for Trea Turner and Max Scherzer.

He would finish the season with a .272/.333/.409 slash line with 3 home runs in 96 plate appearances at the MLB level with the Dodgers and the Nationals.