Looks like HBO is cancelling the whole card.

""We're afraid it is a torn rotator cuff," Schaefer said. "We don't know. As a result, the fight card, which we were all very much looking forward to, has unfortunately been canceled. I hope it will be rescheduled. This is a fight that was on track to selling out in San Jose. It really is very unfortunate that this exciting showdown is not happening at this point. We wish and hope that Robert will be well and that it is an injury that can be taken care of. When I talked to Bob Santos he sounded extremely, extremely, extremely concerned. This is a big setback for (Guerrero).""



Robert Guerrero hurts shoulder, Aug. 27 card on HBO called off - ESPN