The St. Louis Cardinals delivered a commanding performance Monday night, defeating the Milwaukee Brewers 6-3 behind a stellar outing from pitcher Kyle Leahy and a three-RBI night from Iván Herrera.

Leahy (4-3) was the story on the mound, tossing 5 1/3 innings of one-run ball. The right-hander struck out five, walked two, and scattered six hits, keeping the Brewers' offense off balance throughout his start. Closer Riley O'Brien shut the door, recording the final two outs for his 10th save of the season.

The Cardinals jumped out to an early lead in the second inning when JJ Wetherholt singled to center field, scoring Masyn Winn. That proved to be all the cushion St. Louis would need. Herrera blew the game open in the fourth inning with a bases-loaded double, extending the lead to 4-0 and putting the Brewers in a deep hole.

Milwaukee finally got on the board in the sixth when Luis Rengifo drove in Jake Bauers with a single to left. Brice Turang added a solo homer in the ninth—his fifth of the year—to cut the deficit to 6-3, but the Brewers couldn't complete the comeback. They went just 2-for-12 with runners in scoring position, a stat that told the story of their night.

St. Louis tacked on insurance runs in the seventh and eighth innings. Winn delivered an RBI single, and Wetherholt drove in Victor Scott II with another single in the eighth, giving the Cardinals breathing room.

Brewers starter Chad Patrick (2-2) took the loss, allowing four runs on seven hits over 3 1/3 innings, striking out four but walking three. Jackson Chourio provided a bright spot for Milwaukee, going 4-for-4 in his first game back after missing time with a fractured left hand sustained during the World Baseball Classic.

The series continues Tuesday night, with the Brewers sending right-hander Brandon Sproat (0-2, 6.75 ERA) to the mound against the Cardinals' Andre Pallante (3-2, 3.73 ERA).