AO day 4 update

Roger Federer SUI (1) easy cruises to the next round beating Florian Mayer GER 6-1, 6-4, 6-0. So as Guillermo Coria ARG (6), Nikolay Davydenko RUS (5), and Igor Andreev RUS (23).
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Samantha Stosur AUS, Michaella Krajicek NED (over Sania Mirza IND (32)), Aiko Nakamura JPN (over Gisela Dulko ARG (31)), Maria Sanchez Lorenzo ESP (over Anna-Lena Groenefeld GER (22)), Flavia Pennetta ITA (20), Sybille Bammer AUT, Nicole Vaidisova CZE (16) all get through.
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^ Samantha Stosur (Australia)