Maria Sharapova showed her ruthless streak as she destroyed Australian Casey Dellacqua 6-1 6-0 in the evening session at the US Open.
Sharapova was in no mood to hang about on Thursday
A capacity crowd watched in awe as the defending champion unleashed 30 winners, compared to Dellacqua's two.
The Russian was off court inside an hour and goes on to face Poland's 30th seed Agnieszka Radwanska.
"I thought I did a pretty good job of being solid," said Sharapova. "It's only going to get tougher from here."
Martina Hingis reached the third round for the ninth time after coming through a scrappy match against France's Pauline Parmentier.
Hingis was two points away from losing the second set at one stage but prevailed 6-2 7-5.
"I didn't want to play a third set in this heat," said the 1997 champion.
The 27-year-old will meet Victoria Azarenka in the third round after the Belarussian teenager beat Dominika Cibulkova 6-2 6-2.
Fourth seed Svetlana Kuznetsova recovered from a second-set blip to join fellow Russian Anna Chakvetadze in the third round.
Kuznetsova, the 2004 champion, beat France's Camille Pin 6-3 4-6 6-0 despite committing 34 unforced errors.
"In the second set I missed so many of my chances," said the Russian.
"I've been missing so many, I was not moving my feet. It wasn't a good second set for sure but there was nothing I could change. So from that moment on I just started to turn it on and just play the right shots.
"But I'm not happy it went to the third set."
Chakvetadze, the sixth seed, eased past experienced Australian Nicole Pratt 6-3 6-4 to book a meeting with India's Sania Mirza.
Mirza hit 33 winners and the same amount of errors as she defeated American Laura Granville 6-3 7-5.
"In the second set she started playing a lot better," said Mirza.
"I'm happy where I am but I would like to be a little further up. I'm just taking it one match at a time. I'm quite happy with how I'm playing."
Nicole Vaidisova lost her temper in spectacular style but still managed to overcome Italy's Flavia Pennetta 6-2 7-6 (7-0).
After missing the chance to serve out the match at 6-5, the Czech 13th seed smashed her racquet but she recovered her poise to race through the tiebreak.
Patty Schnyder, the 11th seed, breezed past Severine Bremond of France 6-3 6-0 while seventh seed Nadia Petrova wasted little time in dumping fellow Russian Anastasia Rodionova out of the tournament with 7-5 6-1 victory.
Petrova will face 18-year-old Hungarian Agnes Szavay, who ousted Michaella Krajicek 7-6 (7-4) 6-3.