The Athletics’ search for a new ballpark will be confined to Oakland, and Major League Baseball will put off any expansion talks until it solves its two outstanding stadium issues. Baseball Commissioner Rob Manfred said Tuesday the exact site is up to the team’s owners, but he made clear the sport has no intention to allow a move outside the city. ”I am committed to Oakland as a major league site,” he told the Baseball Writers’ Association of America on Tuesday. ”I think that if we were to leave Oakland, I think 10 years from now we would be more likely than not looking backwards saying we made a mistake.”