Astros manager Brad Mills said if there were any communication problems, he wasn't aware of them.
"It wasn't communicated to me by Roy or anyone else," Mills said. "I really don't have an answer for that question. We really wanted to change things up a little bit because of the way we've done it so far and go from there."
Quintero has caught Oswalt in Spring Training but was surprised when bench coach Al Pedrique called him Monday night and told him he'd catch Oswalt. The two haven't been paired up despite being teammates for five seasons.
"I feel happy because I never caught him before in five years, and I hope everything is going to be good between him and me," Quintero said.
The other players to catch Oswalt are: Brad Ausmus (200 games), Raul Chavez (45), Ivan Rodriguez (24), Chris Coste (six), Tony Eusebio (five) and Eric Munson and Gregg Zaun with two games each.