"I'm excited to wear the uniform from Mexico again. I'm really proud wearing those colors," Perez said.
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Manager Dusty Baker is all for Perez pitching for his country, but doesn't want him to pitch too many innings for Mexico.
"We have certain parameters, hopefully no consecutive days and not too many innings," Baker said.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the Time. He also can be
found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.