Query: What pitcher led the Cubs in Game 6?
Context: After losing an extra-inning game in Game 1, the Cubs rallied and took a 3 games to 1 lead over the Wild Card Florida Marlins in the NLCS. Florida shut the Cubs out in Game 5, but young pitcher Mark Prior led the Cubs in Game 6 as they took a 3–0 lead into the 8th inning and it was at this point when a now-infamous incident took place. Several spectators attempted to catch a foul ball off the bat of Luis Castillo.