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There are other options, however, if the Cubs don't sign Dunn, and a trade could be the answer at first base.
While it may seem like a stretch, as many times teams do not like to trade with division opponents, this would be a trade that would benefit both teams.
The Cubs would fill their hole at first base, and acquire the left handed hitter that they are seeking. Alonso, who is one of the Reds top prospects and was ranked 45th in Baseball America's Top 100 this past season, is firmly blocked by Joey Votto at first base and is no doubt available if the right deal came along.
For the Reds, acquiring Marmol would solve one of their biggest holes in the ninth inning role, where Francisco Cordero posted a 40 save season last year, but also blew eight saves and is entering the final year of his contract. He has established himself as one of the games top young relievers.
The Cubs could in turn look to Andrew Cashner or Sean Marshall for the time being in the ninth inning role, or could sign a stop gap option with some of the money they save in dealing Marmol.
Because of Marmol's tremendous value, and the fact that Alonso is still a fairly unproven commodity, the Cubs may seek a second player in the deal, and Boxberger would make sense. The Reds 2009 first round pick, he profiles as a late inning reliever and despite struggling through his first pro season, he still posted a 10.8 K/9 mark.