Chicago Cubs starting pitcher Yu Darvish (back, elbow) threw a 55-pitch bullpen session on Saturday and felt good. He said his arm issue turned into a back issue two weeks ago, but that everything is OK now. It appears that Darvish is getting close to going on a rehab assignment, where he'll need a handful of starts before rejoining the rotation. The Japanese right-hander has been out since May 20 and has a disappointing 4.95 ERA, 1.43 [...]