Serena Williams advances to Miami Masters final with straight sets semifinal win . Defending champion beats Maria Sanchez for 15th time in a row . American will next face Australian Open champion Li Na . `` It 's a good challenge , I think , '' she said . Men 's No . 1 Rafael Nadal sets up semifinal match with Tomas Berdych .
Serena Williams advances to Miami Masters final with straight sets semifinal win . Defending champion beats Maria Sanchez for 15th time in a row . American will next face Australian Open champion Li Na . Men 's No . 1 Rafael Nadal sets up semifinal match with Tomas Berdych .