French Open champion Na Li has secured her passage into the fifth round in Indian Wells following a 6-1 6-0 victory over Klara Zakopalova.
Li took just 30 minutes to secure the win, with her opponent struggling to deal with the pace.
The Chinese player broke twice in the first set to secure it 6-1, while she bettered that with three breaks to secure the match on serve.
Li reached the final of the Australian Open in 2011.
