Rubuta ci gaba ga wannan sakin layi - A rana ta bakwai, ya yi iyo a baya na relay na medley a cikin prelims na 4x100 mita medley relay
, ya ci gaba zuwa wasan karshe tare da sauran 'yan wasan relay Andrew Wilson, Tom Shields, da Blake Pieroni. A ranar karshe ta gasar, wasan karshe ya kammala na farko kuma dukkan 'yan wasan daga wasan farko da na karshe ciki har da Armstrong sun lashe lambar zinare a gasar.