While the Rockies need to keep their 30-year-old shortstop on the field -- he's played over 100 games just once over the past three seasons -- they're also looking to him to be a leader.
"He's at a point in his career where he understands the responsibility of impacting your teammates and making people around you better, and he's embracing that," Weiss said.
Tulowitzki, an All-Star in four of the last five seasons, has spent his entire nine-year career with the Rockies and is a lifetime .299 hitter.
William Boor is a reporter for MLB.com. Follow him on Twitter at @wboor. This story was not subject to the approval of Major League Baseball or its clubs.