Rios, owed approximately $60 million between 2010 and '14, is more likely to be traded in the offseason, if then. Scouts say he is better defensively in center than he is in right, and his offensive numbers also profile better in center.

The Jays would consider moving Scott Rolen, sources say. (Jim McIsaac / Getty Images)

Rolen also will be a difficult mid-season sell due to his contract — he is earning $11 million this season and $11 million in 2010 and possesses a full no-trade clause.

Some scouts and executives have speculated that the Blue Jays might ask a team interested in Halladay to swallow one of their other big contracts, but such an idea is unrealistic.

In addition to Rolen, center fielder Vernon Wells has a full no-trade clause, and Rios has one through 2010.

Still, the D-backs are seeking at least the equivalent of a supplemental draft pick between the first and second rounds for Davis, which is what they will receive if they offer him arbitration and he departs as a free agent.

That pick likely will be between Nos. 40 and 50, and the D-backs have taken two promising left-handers in that range in the past two drafts.

Wade Miley, their fifth-best prospect according to Baseball America, was the 43rd overall pick out of Southeastern Louisiana in 2008. Mike Belfiore of Boston College was the 45th overall pick this year.

The other option for the Diamondbacks is to sign Davis to a contract extension — something that also might appeal to them if they are reluctant to exercise their $8.5 million club option on injured right-hander Brandon Webb.

Rockies outfielder Ryan Spilborghs, who remains of interest to the Phillies, presumably would command a similar package. But the Rockies, at least for the moment, consider Spilborghs too valuable to trade.

The A's landed Hairston for minor-league right-handers Ryan Webb and Craig Italiano and a player to be named. The player to be named is the key to the deal, sources say.