ST. LOUIS (AP) — St. Louis Cardinals outfield prospect Oscar Taveras will undergo surgery after a high right ankle sprain did not respond to treatment. The Cardinals had anticipated the 21-year-old Taveras would make his major league debut this season. He was the Texas League player of year last season at Double-A Springfield, batting .321 with 23 home runs, 94 RBIs and 10 steals.

Taveras was limited to 46 games and 173 at-bats this season at Triple-A Memphis, batting .306 with five home runs and 32 RBIs. Taveras injured the ankle twice this season and hasn’t played since mid-July. General manager John Mozeliak said Taveras’ ankle was not showing improvement.