Rubuta ci gaba don wannan sakin layi - A Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin A wasan karshe na mita 100 na malam buɗe ido, ta lashe lambar zinare kuma ta kafa sabon tarihin duniya tare da lokacinta na 55.98. Vollmer kuma ya yi gasa a cikin 4 × 200-mita freestyle relay
Ka yi haƙuri. Ta yi iyo na biyu tare da lokacin 1: 56.02, yayin da kungiyar Amurka ta lashe zinare tare da lokacin 7: 42.92. A cikin taron ta na ƙarshe, 4 × 100 mita medley relay, Vollmer ta sake lashe zinare tare da Missy Franklin, Rebecca Soni da Allison Schmitt. Ta hanyar yin iyo a kafa, Vollmer ya yi rikodin raba lokaci na 55.48, yayin da kungiyar Amurka ta kafa sabon tarihin duniya tare da lokaci na 3:52.05, ta inganta rikodin da ya gabata na 3:52.19 da China ta kafa a shekarar 2009.