Efficient Djokovic into third round For Novak Djokovic, it was about efficiency as much as anything else. "To win is the objective, but to do it quickly on days as hot as this is just as important," Djokovic said. It is being efficient. The four-time Australian Open winner, defending champion and the world No.2 achieved both objectives in his 6-0 6-4 6-4 second-round defeat of Argentina's Leonardo Mayer. In a performance that did a little to confirm his status and said a lot about his state of mind, Djokovic disposed of Mayer without even getting halfway through the pile of shirts he brought with him to the courtside. "That comes from my quarter-final with Andy Roddick in 2009 when I had to retire," he said. I've matured since then, got physically better, changed a few things in my diet. There are plenty of differences ... I learned a few thing in life, I developed myself. Generally it's much more efficient for me these days to recover and to get ready for the next point. But it's tougher than it looks. It looked lot tougher for Mayer, who never had a break point for the match, was forced into 24 errors and made another 39 on his own. Djokovic advances to a third round against Denis Istoman of Uzbekistan where he should take another efficient step toward the projected final against top seed Rafael Nadal. Joining Djokovic in the third round on Wednesday were Spanish third seed David Ferrer, Czech seventh seed Tomas Berdych and eighth-seeded Frenchman Richard Gasquet. Of the top seeds, Ferrer had the most difficult day, a slip-up in the second set forcing him to stay out in the heat for an extra hour before he triumphed over France's Adrian Mannarino 7-6 (7-2) 5-7 6-0 6-3. Berdych defeated France's Kenny De Schepper 6-4 6-1 6-3 and Gasquet handled the heat better than Russia's Nikolay Davydenko, winning their second-round match 7-6 (7-3) 6-4 6-4. On the other side of the ledger, Russia's Mikhail Youzhny became the first men's seed to go the distance and lose at this year's Open. Youzhny, the 14th seed, made a three-hour bid for survival in sweltering heat before losing 6-4 3-6 6-3 3-6 6-3 to Germany's Florian Mayer in their second-round match. The only other seeded loser on day three was Russia's Dmitry Tursunov, the 30th seed who lost to Istoman in four sets.