Ponson, 29, will give the Cardinals additional depth in their starting rotation, increasing the chances that the team will trade a starting pitcher for a second baseman or corner outfielder.

The Orioles terminated Ponson's contract after he was arrested for driving under the influence on Aug. 25. The players' union has filed a grievance on Ponson's behalf, contending that the team still must pay him the balance of his contract, which runs through 2006.

Despite his off-field troubles and 6.21 ERA in 23 starts last season, Ponson drewa surprising amount of interest as a free agent, receiving attention from the Rangers, Phillies and other clubs.

The Cardinals are gambling that Ponson finally will fulfill his promise after cleaning up his lifestyle and entering their winning environment. Ponson voluntarily spent 30 days in a rehabilitation center last September. He has stopped drinking and lost weight, friends say.

In his grievance, Ponson is seeking $1.1 million in salary from last season and the $10 million he was set to earn this season. The Orioles are expected to lose the grievance, which is scheduled to be heard in March.

Ponson's negotiated base salary with the Cardinals will off-set the Orioles' obligation. His deal also will include an incentive package that also could reduce the Orioles' payment.

In eight seasons with the Orioles, Ponson was 76-91 with a 4.81 ERA.