The Phillies may be the defending World Series Champions, but shortstop Jimmy Rollins still believes that the team has something to prove this season. "Definitely," Rollins said when asked if the team has something to prove. "The last couple years, the last five or six years, the World Series has been won by a different team any year. It's up for grabs every year. It'd be nice to go out there and stake your claim and hold on to it for awhile and be known as the champs, like the Yankees were in the '90s."