Juan Rivera (hamstring) will not be activated from the disabled list Friday as originally hoped. Dodgers manager Don Mattingly said the outfielder was "sore" and "tentative" Wednesday in his first rehab game with High-A Rancho Cucamonga. The good news is that Rivera was back in the lineup Thursday for Rancho Cucamonga and homered in one of his four at-bats. It shouldn't be long before he's ready.