Andy Murray rolled back the years, but even heroes have their limits

The Scot’s feats at the Australian Open have been all the more enthralling for coming at the end of his career, not the peakOver the past week at the Australian Open in Melbourne Sir Andy Murray has often seemed more like a medieval knight than a tennis player, undergoing the kinds of physical trials and feats of endurance that were the stuff of chivalric romances. He’s even carried a war wound from previous campaigns, a metal plate that supports a damaged hip. But in the end, despit