Australian Open: Serena Williams, Maria Sharapova and Agnieszka Radwanska move into third round

Defending champion Serena Williams and fifth seed Maria Sharapova have progressed into the third round of the Australian Open without dropping a set.

Williams breezed through a 6-1 6-2 triumph over Hsieh Su-Wei in just over an hour, immediately breaking her opponent’s serve in the first set.

The American world number one went 5-1 up in less than 30 minutes, and Hsieh had a sniff of a break point, but Williams managed to save before taking a one-set lead.

The 34-year-old kept her momentum as she earned an instant double break before seeing off her opponent and comfortably securing a place in the next round.

Earlier in the day on the Rod Laver Arena, Sharapova overcame Belarusian opponent Aliaksandra Sasnovich 6-2 6-1 in one hour and 13 minutes.

The 2008 champion lost serve twice in the first set, but it did not damage her campaign as Sasnovich could not hold serve in any of her four games.

Sharapova went an early break up in the second set, and Sasnovich tried to fight back by saving three break points in the fourth game, but it was not enough as the Russian broke again before taking the set and the match.

Polish fourth seed Agnieszka Radwanska overcame Eugenie Bouchard in straight sets to reach the Australian Open third round on Wednesday.

Radwanska showed grit and determination, digging herself out of a hole in the first set to see off the fit-again Bouchard 6-4 6-2 on Rod Laver.