Here is Rotoworlds take,
Troy Percival collapsed on the mound after striking out Brandon Boggs on Wednesday.
Percival apparently injured himself after planting his left leg. He stood up and started limping around, and even tried to throw another pitch, but ended up heading to the clubhouse. It's unclear just how serious the injury is, but Dan Wheeler would likely assume the closing job if Percival misses time. Al Reyes is another candidate.
Wheeler appears to be the guy now, and I got him in my AL-only,