MELBOURNE: Bulgaria's Grigor Dimitrov beat US Open champion and world number three Dominic Thiem 6-4, 6-4, 6-0 to reach the Australian Open quarter-finals on Sunday.

The 18th seed won in just over two hours against a fatigued-looking Thiem, last year's runner-up who had come through a five-setter against Nick Kyrgios in the previous round.