Aimar Olaizola Apezetxea, known as Olaizola II is a pelotari, brother of Olaizola I. Olaizola started to play pelota on the local fronton of his hometown, Goizueta, Navarre.

During his career, Olaizola II won in 2005, 2007, 2012 and 2013 the main hand-pelota championship — the singles championship — additionally reaching the finals of 2003, 2006, 2009 and 2015.

(1) Two championships were played in 1999, due to disagreements between the two main professional Basque-pelota companies — Aspe and Asegarce.