Maria Sharapova and Serena Williams got down to business with second round wins, while Lleyton Hewitt notched up his 600th career victory, as the Miami Masters moved into second gear with some of the top seeds getting down to action.

Defending champion and six-time winner in Miami, Serena Williams, returned to action after a self imposed ban on Indian Wells, when she eased to a 7/6, 6/2 straight sets win over Yaroslava Shvedova.

Maria Sharapova, a losing finalist in Miami on five occasions, got her quest off to a flying start, easing past Kurumi Nara, 6/3, 6/4. In other ladies second round action, there were no casualties as Anna Ivanovic, Angelique Kerber, Petra Kvitova, Sara Errani and Wimbledon finalist Sabine Lisicki all advanced safely into the third round of the second Masters Series event of the year.

The rest of the female seeds begin their campaigns today as number two seed and Australian Open champion Li Na takes on Alisa Kleybanova. Last week's losing finalist at the Indian Wells and 2012 Miami winner Agnieszka Radwanska will test her injured knee against Romina Oprandi, while Indian Wells semi-finalist Simona Halep, Jelena Jankovic, Dominika Cibulkova, Carolina Wozniacki and Roberta Vinici will all look to advance through to the third round.

In the men's draw, Lleyton Hewitt joined Roger Federer and Rafa Nadal as the only active players to have won 600 tour matches, when he rallied in typical Hewitt fashion to defeat Robin Haas, 3/6, 6/3, 6/3. Hewitt was joined in the third round by Donald Young, Denis Istomin, Roberto Bautista-Agut, Lukas Lacko and Sam Querry.

Bernard Tomic suffered a humiliating loss to Jarkko Nieminen in his first match back on tour since his loss to Rafa Nadal in the Australian Open. The brash Australian won just 13 points on his way to a 6/0, 6/1, hammering at the hands of the Finn, in a match that lasted just 28
minutes, one minute less than the 29 minutes it took Greg Rusedski to beat Carsten Arriens at the Sydney International in 1996.

Novak Djokovic, looking for a fourth Miami title and second consecutive Masters win following his victory at Indian Wells, begins his quest today against Frenchman Jeremy Chardy.

Roger Federer will look to bounce back from his loss last week to Djokovic in the final at Indian Wells when he takes on big serving Croat Ivo Karlovic. Federer, gunning for his third title in Miami has faced Karlovic on 11 occasions with 10 wins, the Croat’s only victory coming
on the same surface in 2008 at Cincinnati.

Andy Murray opens up his defence without coach Ivan Lendl following their announcement this week that the pair have parted company by mutual agreement. Under the guidance of the former world number one and eight times Grand Slam champion, Murray took his game to a new level with wins at the US Open, Wimbledon and an Olympic gold in London. The Scot begins his defense against Matthew Ebden.

David Ferrer, Grigor Dimitrov, Jo-Wilfred Tsonga and Kevin Anderson are some of the other big names to feature in today’s second round action.

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