Maria Sharapova opened the tournament with a win over Tamarine Tanasugarn on Rod Laver Arena.
Jelena Jankovic snapped out of a six-match losing streak with a victory in the first round.
Another losing streak, five Grand Slam matches in a row, came to a happy end for Jelena Dokic.
Vera Zvonareva rolled to a 62 61 first round win over former Top 20 player Sybille Bammer.
Playing her first Grand Slam as No.1, Caroline Wozniacki opened with a win over Gisela Dulko.
Justine Henin battled back from a tough first set loss to defeat Sania Mirza in three, 57 63 61.
Arantxa Rus made it out of qualifying and beat Bethanie Mattek-Sands in the first round, 61 36 75.
Ana Ivanovic fought off five match points before finally succumbing to Ekaterina Makarova.
Ekaterina Makarova rejoiced after upsetting No.19 seed Ana Ivanovic in the first round, 36 64 108.
Anne Keothavong met with English cricketers Tim Bresnan and Graeme Swann after a hitting session.
Alicia Molik kept the home fans happy with a comeback first round win over Roberta Vinci.
Kim Clijsters handed Dinara Safina the first double bagel loss of her career on Tuesday night.
Venus Williams donned her Wonderland Dress for her second round match with Sandra Zahlavova.
Venus Williams battled for over three hours to stop an inspired Sandra Zahlavova, 67(6) 60 64.
Maria Sharapova lost the first three games of her match with Virginie Razzano but won, 76(3) 63.
Canada's Rebecca Marino nearly got her first Top 10 win but lost to Francesca Schiavone, 63 57 97.
Francesca Schiavone, seeded No.6 here, was relieved after edging Canadian No.1 Rebecca Marino.
Li Na signed autographs for fans after improving to 7-0 on the season with a second round win.
Andrea Petkovic came from a first set blowout to beat Britain's Anne Keothavong, 26 75 60.
Current Russian No.1 Vera Zvonareva and former No.1 Yevgeny Kafelnikov posed with ballkids.