He is known as the Ace of Aces in the Philadelphia Phillies pitching staff. Also known as the Phab Phour, R2C2, or the Phantastic Phour. This group includes Cliff Lee, Roy Oswalt, Cole Hamels, and of course Roy Halladay (the fifth starter is Joe Blanton).
Roy Halladay pitched a Perfect Game and NLDS No-Hitter during the 2010. And he was the 2010 NL Cy Young Award winner, he also won the AL Cy Young Award in 2003 with the Blue Jays.