No. 4 Ryan Zimmerman, Washington Nationals
It had become clear to the Washington Nationals that Ryan Zimmerman was a keeper, so after three years they elected to sign him to a 5-year, $45 million extension before the 2009 season. He rewarded them with his best season yet and looks to be one of the key players they plan to build around.
Zimmerman recorded career bests in HR's (33) and batting average (.292) while also leading the team with 106 RBI's. For his efforts, he earned an NL Silver Slugger trophy.
His exploits went beyond the batter's box, though, as he also impressed in the field— so much so that he was given a Gold Glove to go along with his silver trophy.
The 25-year old third baseman has battled a hamstring injury in the early going, but is currently hitting .370 with 4 HR's in 59 plate appearances. With the Nationals improved club around him, Zimmerman has even more upside potential.