Andy Roddick says the younger American players need to up their work ethic: “There’s no substitute for hard work. To be honest with you, that’s one of the things that lacks when you see the young American players. It puts a different dynamic on things when you’re playing tennis to find a way out of the country as opposed to playing for fun.”

The challengers keep emerging on the pro circuit, the latest being Japanese teen Kei Nishikori, who stunned James Blake to win the Delray Beach title earlier today.