Ka cika wannan magana: A Wasannin Olympics na 2012 a Landan, Grevers ya lashe lambar yabo uku: zinare biyu da azurfa ɗaya. Grevers ya sami lambar yabo ta farko, ta azurfa, ta hanyar yin iyo don ƙungiyar Amurka ta biyu a cikin zafin jiki na farko na tseren mita 4 × 100. A wasan karshe, tawagar Amurka ta zama ta biyu a bayan Faransa. Haɗuwa tare da Jimmy Feigen, Ricky Berens, da Jason Lezak a cikin zafi, Grevers ya yi iyo na biyu kuma ya rubuta lokaci na 47.59. Bayan jagorantar zafin jiki (52.92) da wasan kusa da na karshe (52.66) na tseren mita 100, Grevers ya lashe zinare a wasan karshe na tseren mita 100 tare da lokacin 52.16, ya inganta rikodin wasannin Olympic na Aaron Peirsol na 52.54 da aka kafa a 2008 da kuma sakan 0.76 a gaban Nick Thoman. Ga Grevers, shi ne na farko mutum zinare. A gasarsa ta karshe,
4 × 100 mita medley relay, Grevers ya lashe zinare tare da Brendan Hansen, Michael Phelps da kuma Nathan Adrian. Yin iyo a baya, Grevers ya rubuta lokaci na 52.58 seconds, kuma tawagar Amurka ta ci gaba da cin nasara tare da lokaci na 3: 29.35.