Defending champion Flavia Pennetta sent world No.2 Maria Sharapova crashing out of Indian Wells, rallying to beat the five-time grand slam champion in three sets.
Italy's Pennetta got off to a rough start in the opening set before settling in to take down the mighty Russian who had won twice here previously in 2006 and 2013.
Sharapova committed 11 double faults and was broken four times in the match which lasted just over two hours.
Pennetta advanced to the quarter-finals, where she will meet either Caroline Garcia of France or Sabine Lisicki of Germany.
Pennetta, who won her 10th and biggest title of her career with a 6-2 6-1 win over Agnieszka Radwanska last year, extended her match-winning streak to nine on Tuesday (Wednesday AEDT).
Sharapova was hoping to become the first women to win the Indian Wells title three times.
She started the season by winning her 34th career singles title in Brisbane, then reached the Australian Open final.
This was the fifth career meeting between the two with Pennetta now having a 3-2 edge.
Earlier, world No.1 Serena Williams overcame a slow start to battle past American compatriot Sloane Stephens in three sets to reach the quarter-finals.
The 19-time grand slam winner defeated a dogged Stephens 6-7 (3-7) 6-2 6-2 on centre court as her emotional return from a 14-year Indian Wells boycott gathers pace.
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