Alejandro "Alex" Rivas Concepcion is a Spanish kickboxer currently fighting out of Team Jesus Cabello.

[1] In 2018 Rivas became renowned when he got an upset decision win over K-1 featherweight title holder Yuta Murakoshi at only 17 years old.

He then faced K-1 Super Bantamweight champion Yoshiki Takei in the quarter-final of the 2019 K-1 World Super Bantamweight Tournament and lost by first round TKO.

In August 2019, Rivas signed a two-year contract with the ONE Championship organization.

[2] He is scheduled to make his promotional debut against ONE Flyweight Muay Thai World Champion Rodtang Jitmuangnon in a non-title kickboxing match at ONE Championship: Fists Of Fury on February 26, 2021.