St. Louis Cardinals leadoff hitter Matt Carpenter has signed a six-year contract extension worth $52 million, according to multiple media reports.

The Cardinals have not confirmed the deal but have scheduled a news conference for 11 a.m. ET on Saturday morning from their spring training facility in Jupiter, Fla.

The St. Louis Post-Dispatch reported earlier this week that Carpenter and the Cardinals were closing in on a long-term extension.

Carpenter, 28, enjoyed a breakthrough season in 2013, batting .318 with 11 home runs and 78 RBIs while leading the majors with 126 runs scored.

An All-Star second baseman last season, Carpenter will shift to third base this season for the Cardinals, who plan to use rookie Kolten Wong as their primary second baseman.