Li Na won her Australian Open rematch with Dominika Cibulkova to reach the semi-finals of the BNP Paribas Open in Indian Wells.
Alexandr Dolgopolov stormed into the semi-finals of the BNP Paribas Open with a 6-3 6-4 victory over Milos Raonic.
Andy Murray will hope home comforts and familiar faces can inspire a return to top form in Miami.
Australian Open champion Stanislas Wawrinka suffered his first defeat of the season, losing to Kevin Anderson at Indian Wells.
Second seed Agnieszka Radwanska beat Jelena Jankovic to reach the semi-finals of the at the BNP Paribas Open.
Victoria Azarenka has pulled out of next week's Sony Open in Miami with a foot injury.
Andy Murray insists his back surgery should no longer be considered a factor when analysing his defeats.
Novak Djokovic wobbled but avoided joining Rafael Nadal in making an early exit at the BNP Paribas Open.
Top seed Li Na will play Dominika Cibulkova at the BNP Paribas Open in a rematch of the Australian Open final.
Dominic Inglot and Treat Huey's run in Indian Wells came to an end in the quarter-finals of the men's doubles.