Encouraging news for Dodgers’ injury-plagued pitching staff

LOS ANGELES — In another day of tangible progress for several injured Dodgers pitchers, a key reliever joined the group that is moving closer to a return.
Right-hander Blake Treinen threw sinkers and four-seam fastballs in a bullpen session that marked a promising step after his original ominous diagnosis of right forearm tightness on April 20.
“There’s still some hurdles to get to and get past, and as of right now, I feel like everything’s been going really smoothly,&rdq