San Diego Padres pitcher Matt Waldron has undergone surgery to treat a serious infection, with team manager Craig Stammen indicating that he could start the season on the injured list. Waldron was hospitalized for several days and the surgery, which involved draining an infection near his rear end, has raised concerns about his availability for the upcoming season. Stammen mentioned that Waldron's return will be contingent on how well he heals from the incision and his overall comfort during recovery.