[11] He began 2018 with the Palm Beach Cardinals where he was named to the Florida State League All-Star Game.

[16][17] He was promoted back to Memphis in June, but placed on the injured list that same month after breaking his wrist, ultimately ending his season.

[19] For the 2021 season, Mendoza returned to Memphis, slashing .242/.305/.290 with one home run, 27 RBIs, and 14 doubles over 116 games.

[22] On December 7, 2022, the San Diego Padres selected Mendoza from the Cardinals in the minor league phase in the Rule 5 draft.

[23] He split the 2023 season between the rookie–level Arizona Complex League Padres, Double–A San Antonio Missions, and Triple–A El Paso Chihuahuas.

Playing in just 31 total games due to injury, Mendoza hit .226/.274/.287 with two home runs, 11 RBI, and five stolen bases.