Reyes will start Sunday against the Giants.
The Cardinals have not said explicitly that Jaime Garcia is out of the starting rotation for good, but Reyes will take Garcia's turn Sunday in the series finale in San Francisco. Walks have been a big issue for Reyes at the major league level -- he issued six free passes over 4.1 innings in his last appearance -- and while he's been able to limit the damage to this point, he's been somewhat lucky with a strand rate north of 91 percent.