Perhaps the most talented member of this list, Dan Haren can easily be an ace on just about any staff. In 2008, Haren, currently a member of the Arizona Diamondbacks, was the second part of a dominant 1-2 punch, along with Brandon Webb. But Webb has not thrown a pitch since Opening Day last season, and the D-Backs currently sit in last place in the NL West, 17.5 games off the pace.
Haren is having somewhat of a down year (as are most of the Diamondbacks). He comes into play tonight at a 7-7 clip and a 4.36 ERA. His 147 hits allowed are the most given up in the league.
But he has a track record of being a very reliable starter, and for a pitcher, he is a really good hitter. Therefore, teams in the National League will be taking a close look at Haren's start against the Padres tonight. His current contract expires at the end of the 2012 season.
He's owed $29 million guaranteed, with a $15.5 million club option for 2013. He'll be 30 years old two months from tomorrow, and his trade value is going to be very high. But like they say, in order to get something, you have to give something.