Update zu Mattek-Sands:
"I ruptured my patellar tendon, and I’m going to be needing surgery, so I'll be out for a while," she said.
Mattek-Sands also dislocated her patella in her fall, saying that she heard a "pop" in her leg as she stepped towards the net.
"I knew it was either dislocated or broken, and at that point, I kind of freaked out," she said.