From the official site:

Many wondered how Mariano Rivera would feel the day after he pitched for the first time in more than three weeks. Everyone, in fact, except Rivera.

"I knew right away by how I felt [after the game]," the Yankees closer said. "I feel normal, and it makes me feel great." ...

"I'll pitch Sunday," Rivera said, "And the playoffs will be normal. I'll do whatever I have to do."