6:49 PM - Riley O'Brien (STL) (forearm) will begin a throwing program this week, Katie Woo of The Athletic reports.

7:32 PM - Riley O'Brien (STL) (forearm) underwent an MRI on his right flexor tendon Monday, John Denton of MLB.com reports.

3:17 PM - Riley O'Brien (STL) was placed on the 15-day injured list Sunday with a flexor strain in his right forearm.

4:00 PM - Riley O'Brien (STL) has allowed three hits and struck out two without walking a batter over three scoreless innings in Grapefruit League play.

10:22 AM - Riley O'Brien (STL) Cardinals acquired O'Brien from the Mariners for cash considerations and purchased his contract from Triple-A Memphis on Monday, Derrick Goold of the St. Louis Post-Dispatch reports.