US Open champion Dominic Thiem said he was not a “machine” and simply had a “real bad day” in stumbling out of the Australian Open to Grigor Dimitrov on Sunday.

The Austrian third seed, a finalist last year, was shocked 4-6, 4-6, 0-6 by the Bulgarian to miss out of a place in the quarter-finals. He admitted to dealing with “some little physical issues”, but didn’t want to elaborate, insisting: “I don’t want to find any excuses. But the thing is that I’m also not a machine,” he added.