Mafio failed to advance into the semifinals , as he placed fiftieth out of 86 swimmers in the prelims .
Mafio touched out Jamaica 's Jevon Atkinson to hit the wall first in the fourth heat by three hundredths of a second ( 0.03 ) in 23.58 .
Mafio failed to advance into the semifinals , as Mafio placed fiftieth out of 86 swimmers in the prelims .
Mafio touched out Jamaica 's Jevon Atkinson to hit the wall first in the fourth heat by three hundredths of a second ( 0.03 ) in 23.58 .