Just how worried are the “big cheeses” in charge of the first Masters events of 2010? As the men’s Tour heads towards the climax of the early hard court season in North America, the window of preparation is closing fast. Yet there are worrying signs about who will actually start, let alone stay, the course.With the news this week that Juan Martin Del Potro will be absent for between one and two months due to a recurrence of a wrist injury, it will be touch and go whether the world No 5 is able to play in either Indian Wells—which begins in four weeks’ time—or in Miami—six weeks hence.This comes on the heels of Rafael Nadal’s departure from the circuit in the quarterfinals of the Australian Open, also for at least a month. He is still targeting Indian Wells for his return. But the...

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