The Chicago Cubs have added an ace to a rotation that consisted of Jason Hammel, Jake Arrieta and Kyle Hendricks. Jon Lester has agreed to a 6-year, $155 million dollar deal, according to FOXSports.com’s Ken Rosenthal. The next best offer for Lester came from his former team, the Boston Red Sox, which was six years and $135 million. In nine seasons, Lester has a career mark of 116-67 with a 3.58 ERA.