Pamberi pokutanga mwaka wake wekutanga kuPurdue, musi waJune 18, 2015, Swanigan akaziviswa senhengo ye12-murume 2015 USA Basketball Men's U19 World Championship Team ye2015 FIBA Under-19 World Championship
iro rakakunda menduru yegoridhe muHeraklion, Crete. Pakuita chikwata, Swanigan akati, "Ndinogara ndichizviitira zvinangwa. Ndakagadza nharidzano dzechirimo chino. Chimwe chezvinangwa zvangu ndechokupinda muchikwata ichi kuti ndipedze basa rangu rokusekondari". Kugadzirira mitambo, Swanigan akatamba muNike Hoop Summit, McDonald's All American Game, uye Jordan Brand Classic. Swanigan haana kutora chikamu muIndiana-Kentucky All Star Game kuitira kuti akwanise kuenda kumusasa wekudzidzira weU19. Akanga ari mumwe wevatambi vashanu vakadzoka kubva kuchikwata cheU17 chakahwina menduru yegoridhe. Swanigan's teammate Vince Edwards akanga ariwo mumutambo kuti aite chikwata, asi akabudiswa mumutambo we16. Chikwata chakapedza 7<unk>0, uye Swanigan avhareji 6.1 pfungwa uye 4.4 rebounds pamutambo.