Roberto Bautista Agut produced a big upset in the BNP Paribas Open in Indian Wells as he dumped out fourth seed Tomas Berdych.
World No 5 Berdych was playing his opening match in the second round of the event but fell to the 53rd-ranked Spaniard, who came back from a set down to win 4-6 6-2 6-4.
Bautista Agut beat Juan Martin del Potro to make the Australian Open last 16 and bagged another big win in California by outmuscling Berdych with his ground game.
"I played unbelievable," said the winner. "I was not serving very well, I had to play my best tennis from the baseline to win the match."
Berdych has been in good form this year, making the semis at the Australian Open and winning in Rotterdam, but the 28-year-old said he did not feel at his best from the start.
"Anything I touched today was basically bad and was wrong," he said. "Definitely my worst match that I had this year.
"I just started to feel not tight but not that crisp, like in the last couple of weeks."