Juan Martin Del Potro usually done merits in the field to reap joy. But this week I need not even lift a finger to add a new satisfaction, as was announced at the time, the Tandil came to fourth place in the ATP world rankings, the best location of his career. Del Potro benefited because the Scot Andy Murray, now relegated to fifth place, did not play the Doha ATP and thus lost the 250 points he had won last year, when he took the title. Thus, it exceeded by only 5 points. Why is this important location of Del Potro, though it will last only a week, he in turn will lose 250 points from its title in 2009 in Auckland-? Because the Tandil be among the four top-seeded for the Australia Open, which starts this Sunday, and so on to avoid the semi-finals clash against the three best in the world: Roger Federer, Rafael Nadal and Novak Djokovic. Good news, though to be champion, "As the old adage-you have to win them all.