The Chicago Cubs need to add a starting pitcher at the trade deadline, but amid a seller's market, they're going to have to give up one of their top prospects if they want to land a name like Pittsburgh Pirates righty Mitch Keller.

The Chicago Cubs sit in first place in the NL Central, but they reportedly won't be satisfied without some postseason success this year.

With Major League Baseball's trade deadline less than two weeks away, the rumor mill is now in full operation. One name in particular seems popular among contenders: Pittsburgh Pirates right-hander Mitch Keller,