Game tied 6-6, 10th inning. Big Pressure. No problem for Rockies newcomer Justin Morneau.

The veteran first baseman crushed a two-run, walk-off homer to center off Dale Thayer on Sunday afternoon, lifting the Rockies to an 8-6 victory over the San Diego Padres at Coors Field.

Morneau hit a 3-2 fastball for the sixth walk-off home run of his career. Center fielder Cameron Maybin made a desperate leap at the wall, but Morneau's drive just kept going.

"I thought I hit it good off the bat, but it scared me a little bit when I saw him drifting back toward the bullpen," Morneau said. "But as good of an athlete as he is, if he can't catch it, then it's definitely gone. It was scary there for a moment, but it was a good feeling when it went out."

With Carlos Gonzalez on base with a single and running with the pitch, Morneau wasn't necessarily thinking home run.

"I just wanted to stay aggressive," he said. "That was one of those cases where, with a runner on, I just wanted something to drive. It was almost the same pitch I missed on a 3-1 count."