Second seed Maria Sharapova is through to the semifinals of the Miami Masters after crushing French Open champion Li Na in straight sets on Tuesday.
Sharapova, who has never won the Miami title despite reaching three previous finals, won eight games in a row on her way to a 6-3 6-0 success in just 68 minutes.
The win also ended eighth seed Na's recent superiority over Sharapova, with the Chinese player having won their last four previous meetings in straight sets -- including in the semifinals at Roland Garros.
Sharapova will now face either fourth seed Caroline Wozniacki or 10th seed Serena Williams for a place in the final.
Meanwhile, there were no surprises in the men's section as second seed Rafael Nadal became the first player to reach the quarterfinals.
Nadal proved too good for 16th seed Kei Nishikori, reaching the last eight with a 6-4 6-4 victory, and he now faces either Jo-Wilfried Tsonga or Florian Mayer for a semifinal place.
The Spaniard is joined in the quarters by eighth seed Mardy Fish and ninth seed Janko Tipsarevic.
Fish was taken to three sets by 12th seed Nicolas Almagro, eventually prevailing 6-3 6-7 6-3, while Tipsarevic ended the run of unseeded Bulgarian Grigor Dimitrov, winning 7-6 6-2.
Tipsarevic will next play Andy Murray or Gilles Simon, while Fish will face Andy Roddick in an all-American quarterfinal provided his compatriot can overcome Argentina's Juan Monaco.
