 Jung akakwanisa kupinda mumakwikwi maviri ekushambira mu2012 Summer Olympics muLondon, nekukunda nguva dzakapinda muFINA B-standard dza2:02.50 200 m individual medley uye 4:18.98 400 m individual medley kubva kuFINA World Championships muShanghai, China. Mumakwikwi emamita 400, Jung akashora vamwe vanoshambira vanomwe pakupisa kwechipiri, kusanganisira mutambi weOlympic kaviri Raphaël Stacchiotti wekuLuxembourg. Akabata nzvimbo yechishanu uye makumi maviri nesere zvachose nezvikamu mazana matanhatu zvechipiri 0.06 kumashure kweBelarus Yury Suvorau nePortugal Diogo Carvalho, kunze kwenguva yake yekupinda ye4: 23.12. Muchiitiko chake chechipiri, 200 m m mumwe nomumwe, Jung akakunda muduku wekuUkraine uye kaviri mukwikwidzi weEurope wechidiki Maksym Shemberev weUkraine kuti atore kukunda kwekutanga kwe0.07 yechipiri, nenguva ye 2:03.33. Jung akakundikana kuenda kumasemifinal, sezvo akaisa makumi matatu nemaviri mumakwikwi ekutanga. 