The Diamondbacks acquired Adam Dunn from the Cincinnati Reds today in exchange for minor league pitcher Dallas Buck and two players to be named later.

Dunn, a free agent at the end of the season, is hitting .233 with 32 home runs and 74 RBIs. He has a .376 on-base percentage and a .528 slugging.

Buck, 24, this season went 1-4 with a 3.94 ERA in 9 games and 8 starts with Class A South Bend. Last Monday he was promoted to High Class A Visalia and made one appearance, pitching 5.0 shutout innings Thursday vs San Jose. He will be assigned to Class A Sarasota.

Buck was selected by Arizona in the third round of the 2006 first-year player draft. He attended Oregon State University, where he was a member of the 2006 NCAA national championship team. He made his professional debut last season by going 4-4 with a 3.41 ERA in 16 starts with Visalia.

The Diamondbacks claimed Dunn off waivers last week and finalized the trade this morning.