The rainout will give catcher Yadier Molina another day of rest. Molina, who suffered a fractured left wrist four weeks ago, was activated Wednesday and would have been in the starting lineup Thursday.
Thursday's postponement also brought a free day of rest to Albert Pujols, who was not going to start.
When Molina was activated, catcher Kelly Stinnett, who ostensibly was retired before the Cardinals obtained him, was designated for assignment. Stinnett, who hit .184 in 44 at-bats, has the option of reporting to Class AAA Memphis. He probably will be brought back in September if he chooses to go to the minors.
Right-hander Brad Thompson, who was to have started Friday in Cincinnati, will be moved back to make room for Wainwright. Lefty Mike Maroth, who gave up just two hits and one run over 7 1/3 innings in his first Cardinals start Monday, is likely to take his scheduled turn Saturday in Cincinnati.
NOTES AND QUOTES
--INF Scott Spiezio, who missed Wednesday's game with a left index finger infection, was not in the Cardinals' starting lineup Thursday before the game was rained out.
--SS David Eckstein, who has been on the 15-day disabled list with lower back spasms, is eligible to come off the list Friday night in Cincinnati.
--RHP Anthony Reyes has received only 14 runs of support in 12 starts while he has been on the mound. "I hope that most of the guys that are playing are irritated," manager Tony La Russa said after Reyes was blanked 2-0 on Wednesday. "Because they are the ones who can do something about it."
--RHP Kip Wells will be in the bullpen until further notice as RHP Braden Looper is set to come off the disabled list, LHP Mike Maroth has joined the rotation and RHP Brad Thompson will be moved back to the rotation from the bullpen. Wells (3-11) pitched five innings of one-run ball in his last start Sunday.
--Wells and RHP Adam Wainwright both are hitting over .300 as starting pitchers. Wells is 9-for-26 (.346) and Wainwright 7-for-23 (.304).
--The Cardinals have lost five of the six games they've played against the Mets this season and have scored only nine runs.