The final tilt of the Sweet 16 pits a pair of young National League star position players. Rockies shortstop Troy Tulowitzki has emerged as one of the game's greatest players this season, while Giants catcher Buster Posey already has a World Series ring and plays a premium position with strong offensive skills. Why Tulowitzki is a Franchise Player Troy Tulowitzki has been among the game's best for a few seasons, but his 2010 campaign put him on the map as a superstar. He hit .315 with 27 home runs and 95 RBIs for the Rockies in a mere 122 games. Perhaps even more impressively, he struck out just 78 times and had a .381 OBP and .949 OPS. He earned his first All-Star berth in the process and finished fifth in the NL MVP voting despite missing a quarter of the season. In addition to his offensive brilliance, Tulowitzki is also an above-average defensive shortstop. He has one Gold Glove in his trophy case and has finished among the top 10 in defensive WAR (NL) twice in his four full seasons. The NL has been put on notice this spring that the best may be ahead for Tulowitzki. He was red-hot to begin the season, but has come back down to Earth since. Why Posey is a Franchise Player Buster Posey was selected by the Giants with the fifth overall pick in the 2008 First-Year Player Draft. A little more than a year later, the catcher made his major-league debut with San Francisco. He struggled in just seven games, hitting .118 with four strikeouts towards the end of the 2009 season. He didn't disappoint last year, however, hitting .305 with 18 home runs, 67 RBIs and just 55 strikeouts in 406 at-bats. Posey also had a .357 OBP and .862 OPS in 108 games for the eventual World Champions. The young catcher was also a strong defender for the Giants, committing just six errors despite being just 24 years of age. He caught 37.1% of runners stealing (fourth in the NL). When you consider that he makes just $575,000 this season, he's one of baseball's best bargains. Click here to see this year's 'Be A GM' bracket.