As the final week of spring training approaches, it's time for the San Francisco Giants to decide who goes north to AT&T Park.Some established players already have a spot on the team, but others must earn their way to the big club in 2015. Here are three players who impressed this spring. 5 Questions Giants Face For 2015 Season 1. Matt DuffyAlthough Duffy had clutch postseason moments last year, it was no guarantee he would make the team in 2015. With his impressive spring, he could provide bench depth for the Giants. So far, he is hitting .383, with two home runs and 12 RBIs in 47 at-bats. He also has a very good on-base percentage of .420. And he's got wheels too, as we saw in Game 2 of the National League Championship Series when he scored the tying run from second base on a wild pitch in the 9th inning. Duffy could be a valuable piece off the bench for the Giants in 2015. And as of Sunday night, he is still on the Giants' active MLB roster. "The Yard" Opens Friday in Giants Parking Lot A Your browser does not support iframes.2. Casey McGehee Giants Score 5 in 9th, Rally to Edge Mariners 9-8 One of the major questions the Giants faced in 2015 was how the Giants...