Yankees center fielder Curtis Granderson made a pair of game-saving catches against the Tigers in Tuesday night's do-or-die Game 4. Granderson is coming off an MVP-type season offensively, but just a few years ago there were concerns about his defense. Back in 2009, when he was with the Tigers, the organization had concerns about his reads and routes in center field. The following spring, manager Jim Leyland acknowledged that center field was a "tough place to play in Detroit," and said that Granderson also had problems on the road "a little bit, too." Some advanced metrics still depict him as a below-average defender. One such ratings system -- "The Fielding Bible" plus-minus on Bill James Online -- ranked Granderson 33rd among major-league center fielders this season. However, Yankees general manager Brian Cashman disagrees. "We have him as an above-average defensive outfielder," Cashman said. "Our numbers don't match some of that stuff. He comes out high on our defensive measurements."