The Diamondbacks are expected to start seriously listening to teams interested in trading for starting pitcher Dan Haren.

Arizona has made almost every player available (only Justin Upton and Ian Kennedy are untouchables), but the conventional wisdom has been that the club would prefer to keep Haren, a tough-to-replace starter. But with the economy sputtering in Arizona, the team now seems more serious than ever about a trade.

The price tag for Haren is still high -- Arizona wants two starting pitchers and bullpen help in return. But even though Haren isn't having a great year (7-8, 4.60 ERA, 1.348 WHIP), he has an established track record and reasonable contract that will pay him $12 million annually.

The Yankees, Cardinals, Phillies, Tigers and Twins are known to be seeking a starting pitcher and could have payroll flexibility. Haren can block trades to 12 teams.

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