Neither Shelton, 20, nor Rune, 19, had gone this deep at the Australian Open. Playing in fourth-round matches on different courts, only one advanced to the quarterfinals.
Shelton beat fellow American and former Ohio State Buckeye J.J. Wolf in the Round of 16 to advance to the quarterfinal. His fourth-round victory made him the first American man to reach a major quarterfinal before turning 21 since Andy Roddick did so at Wimbledon in 2003.