Mike Shildt got a glimpse of the St. Louis Cardinals' future Wednesday night.

The interim manager was plenty encouraged by what he saw in a 6-3 win over the Colorado Rockies.

Rookie outfielder Tyler O'Neill hit a tiebreaking pinch single in the sixth inning and five rookie relievers dominated over 6 1/3 innings to lift the Cardinals.

Bader, also a rookie, had three hits and used his speed to leg out a double and set the stage for the winning tally.

St. Louis starter Luke Weaver allowed two runs in 2 2/3 innings before handing off to the bullpen. Daniel Poncedeleon followed with 2 1/3 scoreless innings, and Austin Gomber, Dakota Hudson, Jordan Hicks and Mike Mayers closed it out. Gomber (1-0) got his first career victory with a scoreless inning. Mayers allowed a run in the ninth but struck out three.

Bader doubled with one out off Kyle Freeland (9-7) to start the go-ahead rally. O'Neill followed with a run-scoring single up the middle, his first pinch hit in nine attempts, to break the 2-all tie. O'Neill was recalled from Triple-A Memphis on Tuesday.

''That was a big-time at-bat he took,'' Shildt said. ''You saw him bear down and take a nice swing. It was good to see.''

The relief corps allowed one run and two hits.

Yadier Molina added a two-run double in the eighth to push the lead to 5-2. Marcell Ozuna followed with a run-scoring hit.

Paul DeJong cut the early 2-0 deficit in half with an RBI hit in the third. Poncedeleon brought in Yairo Munoz with a groundout to tie it in the fourth.

Freeland gave up three runs on nine hits in 5 1/3 innings. He struck out five and walked three.

St. Louis has won 17 of its last 21 at home against the Rockies.