Zaza's debut at an international athletics competition was at the 2014 World Junior Championships in Athletics. Zaza competed in both the 110 metres hurdles and the 400 metres hurdles. For the heat round of the 110 metres hurdles, Zaza was drawn in heat two, a heat containing seven other athletes alongside Zaza. In his heat, Zaza ran a time of 13.66 seconds, a season's best for him, to finish third in his heat. He finished 0.07 seconds behind the heat winner, American Theophile Viltz, and 0.02 seconds behind the heat runner-up, Patrick Elger of Germany. Overall, Zaza was the equal ninth quickest athlete (equal with Hungarian Valdó Szücs) in the heat round. As the top three athletes from each heat qualified for the semi-finals, Zaza progressed. In the semi-final, Zaza ran a Liberian junior record time of 13.53 seconds to finish second in the race. Zaza was 0.08 seconds behind the race winner, Jamaican Tyler Mason. Overall, Zaza's time was the fifth quickest in the semi-final round. As the top two finishers from each semi-final qualified for the final, Zaza progressed. In the final, Zaza ran a time of 13.38 seconds. The time was a new African junior record in the 110 metres hurdles. Zaza finished fourth, 0.39 seconds behind the winner, Wilhem Belocian of France. In the 400 metres hurdles, Zaza did not progress past the heats after his time of 55.38 seconds was not quick enough to progress.