Dominic Thiem has suggested a combination of factors contributed to his defeat to Grigor Dimitrov at the Australian Open, as the Austrian said he is "not a machine".

Thiem had to dig deep to beat Nick Kyrgios in five epic sets in the third round, and the well was dry when he attempted to find reserves against Dimitrov.

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The number three seed has suggested he was carrying an injury into the match, but did not want it to detract from Dimitrov’s 6-4 6-4 6-0 success.

"A combination of some little physical issues, plus a real bad day, plus the fact that he's a great player ... a result like that can happen," the 27-year-old US Open champion said.

"I'm not a machine. Sometimes I would like to be, but there are really, really bad days.

As soon as you're not 100% at this level, then results like this come up, and that's exactly what happened today."

Thiem battled back from two sets down to beat Kyrgios a couple of nights previous, but he had nothing in the tank to produce a repeat against Dimitrov.

Highlights: Dimitrov downs exhausted Thiem in huge shock

"It was a special match two nights ago, and I woke up maybe a little bit different than on a normal match, especially with all the energy from the crowd," Thiem said. "But ... it didn't really affect me today."

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