By Mark Lamport-Stokes CHASKA, Minnesota, Sept 29 (Reuters) - Very rarely is a reigning major champion benched for the opening session of a Ryder Cup, but Masters winner Danny Willett found himself in exactly that position at Hazeltine National on Thursday. "No, it's a little bit of cat-and-mouse whenever you put pairings out together in practice rounds this week," Clarke told reporters after announcing his four pairings for Friday to get the 41st Ryder Cup under way. "And certainly with regard to Danny, he will be playing tomorrow afternoon. More...