Rubuta ci gaba don wannan sakin layi - A 2012 U.S. Olympic Trials a Omaha, Nebraska, da cancantar saduwa ga tawagar Olympics ta Amurka, McGill ya zama na biyu a cikin mita 100 na butterfly tare da lokaci na 51.32 seconds, kawai a baya Michael Phelps kuma kawai a gaban Ryan Lochte. A gasar Olympics ta 2012 a London, McGill ya zama na shida a mita 100 na malam buɗe ido
, kuma ya sami lambar zinare ta hanyar yin iyo a cikin wasan farko don tawagar Amurka da ta yi nasara a tseren mita 4 × 100.