Morgan Riddle just gave both Taylor Fritz and Carlitos Alcaraz a public nudge to 'lock in' at the Australian Open after a sweet fan moment in Melbourne. With Fritz taking down Stan the Man in his last AO and Carlitos cruising without dropping a set, the stakes are sky-high. Will the American or the Spanish phenom rise to the challenge? This rivalry could define the second week! #Sports #Tennis #AustralianOpen