Newly acquired Pittsburgh pitcher A.J. Burnett is expected to miss two to three months while recovering from surgery for a facial fracture, forcing the Pirates to rearrange their plans for Opening Day. The Pirates had hoped Burnett would be able to start April 5 in the opener at home against Philadelphia. Pittsburgh got the 35-year-old right-hander on Feb. 19 from the New York Yankees in a trade for two minor leaguers and cash.