CARMEL, Indiana (Reuters) - First there was Tiger Woods and Ernie (Els), then there was Tiger and Sergio (Garcia) and Tiger and Phil (Mickelson). Now it is Tiger and Rory (McIlroy) and it shows every of sign of becoming one of golf's great all-time rivalries as the young Northern Irishman and veteran American went toe-to-toe at the BMW Championship on Thursday. After carding birdies on their ...