Spencer added the Marlins will receive minor leaguers Elliott Soto and Ivan Pineyro in the deal.
Soto is a 25-year-old shortstop in Double-A, hitting .275/.388/.314. Pineyro is a 23-year-old right-handed pitcher also in Double-A with a 3.69 ERA and 92 strikeouts in 107.1 innings.
The Cubs have been in the market for pitching leading up to the trade deadline. They had been connected to front-line starters like Cole Hamels and David Price, as noted by David Kaplan of CSNChicago.com, but both players wound up getting dealt to other teams.
That left the Cubs scrambling on the second-tier market before finally settling on Haren, who isn't a bad alternative. The 34-year-old isn't a long-term investment, as he is playing out the final year of his contract, so he didn't cost nearly as much in terms of talent as Hamels and Price would have.
Haren has also been an effective starter this year for the first time since 2011. In 21 starts this season, he's posted a 3.42 ERA with a 1.093 WHIP, per Baseball-Reference.com.
ESPN.com's Jerry Crasnick pointed out where Haren's WHIP stacks up with some of the NL's best starters in 2015:
One concern for Haren is how his game will translate going from spacious Marlins Park to Wrigley Field, since he's allowed 21 home runs in 129 innings so far. Giving up fly balls in Wrigley is a recipe for disaster, though he's often been a pitcher capable of adjusting to different circumstances.
Considering the low cost in players the Cubs gave up, as well as the need for another starter with Tsuyoshi Wada on the disabled list, Haren makes sense for this rotation looking to make a playoff push.
Soto and Pineyro stats via MiLB.com unless otherwise noted