The pitcher lasted just five innings in his return Friday at Miami, giving up five runs (three earned) on eight hits in a loss.
"I felt good," Westbrook said. "I was throwing a really good sinker, tonight. I was locating it a lot better than the last start."
Anthony Rizzo opened the second with a single and went to third when second baseman Matt Carpenter's throw to start a potential double play sailed over the Kozma's head and into leftfield. Rizzo tagged up on a sacrifice fly from Barney and scored after knocking the ball out of Molina's glove.
Carpenter singled to start the first and scored on Craig's hit to center.
NOTES: The Cardinals earned at least a split of the four-game series. ... Jackson's exit with one out in the fifth snapped a five-game streak in which the Cubs' rotation recorded a quality start and a seven-game stretch in which it went at least six innings. ... Craig is hitting .431 with runners in scoring position. ... Rizzo's single in the second ended a 0-10 streak. ... Molina was assessed with his third error of the year for dropping the ball in the second and allowing Ryan Sweeney and Welington Castillo to advance. He had three all of last season. ... Major League Baseball made two scoring changes from the Cardinals' game June 11 at the New York Mets. It rewarded Molina a double rather than an error as originally scored and changed an error assessed to 3B David Freese to a hit for David Wright.