Welington Zaza

Zaza's debut at an international athletics competition was at the 2014 World Junior Championships in Athletics.[4] Zaza competed in both the 110 metres hurdles and the 400 metres hurdles.[4][5] For the heat round of the 110 metres hurdles, Zaza was drawn in heat two, a heat containing seven other athletes alongside Zaza.[4] In his heat, Zaza ran a time of 13.66 seconds, a season's best for him, to finish third in his heat.[4] 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.[4] Overall, Zaza was the equal ninth quickest athlete (equal with Hungarian Valdó Szücs) in the heat round.[6] As the top three athletes from each heat qualified for the semi-finals, Zaza progressed.[6] In the semi-final, Zaza ran a Liberian junior record time of 13.53 seconds to finish second in the race.[7] Zaza was 0.08 seconds behind the race winner, Jamaican Tyler Mason.[7] Overall, Zaza's time was the fifth quickest in the semi-final round.[8] As the top two finishers from each semi-final qualified for the final, Zaza progressed.[8] In the final, Zaza ran a time of 13.38 seconds.[9] The time was a new African junior record in the 110 metres hurdles.[3][9] Zaza finished fourth, 0.39 seconds behind the winner, Wilhem Belocian of France.[9] 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.[5]

At the 2015 World Championships, Zaza was the only competitor from Liberia.[10] He competed in the 110 metres hurdles.[11] He finished last in his heat (of athletes that finished) in a time of 14.56 seconds.[11] Zaza was the second slowest athlete overall in the heat round.[12] Zaza did not progress to the semi-finals.[12]