Kansas City Royals starting pitcher Danny Duffy (shoulder) will start a rehab assignment with Double-A Northwest Arkansas on Saturday, according to manager Ned Yost. Duffy threw 61 pitches on Monday and is scheduled to bump up to 75 to 80 pitches in his start this weekend. The left-hander will return to KC's rotation sometime early next month, but he's not very attractive to fantasy owners after he posted a disappointing 4.88 ERA, 1.49 [...]