(SportsNetwork.com) - The St. Louis Cardinals may have walked away with a win on Saturday, but they lost a whole lot more in the process. Nonetheless, St. Louis goes for a sweep on Sunday in the finale of their three-game series with the Milwaukee Brewers at Miller Park.

St. Louis won its fourth straight game on Saturday, as Matt Holliday belted a three-run homer in a 5-3 victory.

The win came at a cost, though, as ace Adam Wainwright was forced to exit with what the team is calling a left ankle injury while popping up during an at-bat in the fifth inning. Matt Belisle (1-0) was credited with the victory after tossing 1 2/3 scoreless innings in relief.

"It's pretty somber in there right now," Cardinals manager Mike Matheny said on the impact of Wainwright's injury. "I don't know of a more respected guy on the team."

With the way the Cardinals were talking after the game the belief is that Wainwright may have suffered an Achilles' injury, which could sideline him for season.

"I've never had anything down there to compare it to," said Wainwright. "I'm thinking what in the heck just hit me. I thought the catcher's mask must have hit me. Or the bat must have hit me.

"It's in the back of my ankle. Everything right now is all speculation. I've not got my hopes up or down."

Kolten Wong added an RBI triple and Matt Carpenter went 2-for-5 to extend his hitting streak to 12 games and help St. Louis win for the ninth time in 10 outings.

The Brewers, on the other hand, continue to head in the opposite direction. Saturday's setback was the club's ninth in 10 games and dropped their season record to an MLB-worst 3-15.

"We're not playing good baseball and it's happening all the way around," Brewers manager Ron Roenicke said.

Getting the call for the Cardinals on Sunday will be righty Lance Lynn, who has not surrendered more than one earned run in any of his three starts. Lynn did not get a decision on Tuesday in Washington, but pitched well, as he gave up just a run and five hits in 6 1/3 innings of a 2-1 loss.

Lynn, who is 1-1 with a 1.56 ERA on the season, is 6-2 in 15 games (11 starts) versus the Brewers with a 2.23 ERA.

Milwaukee, meanwhile, will counter with righty Mike Fiers, who has lost all three of his starts and is pitching to a 6.75 ERA. Fiers' latest setback came on Tuesday against Cincinnati, as he allowed eight runs (4 earned) and six hits in four innings.

Fiers has faced the Cardinals seven times (5 starts) and is 2-2 with a 1.62 ERA against them.

Milwaukee lost two of three games at St. Louis from April 13-16.