CHICAGO -- The Cubs head into the second half of the season on a roll, boasting the best record in the National League despite not having two of their biggest offseason free-agent signings contributing as expected.
Yu Darvish, who signed a six-year deal in February, has been limited to eight starts because of injuries, while Tyler Chatwood, who signed a three-year deal, leads the Major Leagues in walks. Manager Joe Maddon predicted this year's rotation would be the best he's had in Chicago, but Kyle Hendricks and Jose Quintana also have not performed as expected.