One week after the US Open, there’s no rest for the weary men as most of the top stars are in action in the semifinals of the Davis Cup.

The big exception is Novak Djokovic, who’s sitting this one out. Can you blame him? No one goes deeper into matches than Nole. Everyone needs a break from time to time, and, frankly, I envy him his.

That said, everyone else seems to have something to prove this weekend. Rafael Nadal, after a dismal year, is seeking redemption for himself and the Spanish team in their defeat of the Danish. Andy Murray is burnishing his Davis Cup legacy in an attempt to earn a berth for the British in the finals against Argentina. ...