Left-hander Drew Smyly became the first of the 181 free agents to switch teams when he agreed Monday to an $11 million, one-year contract with the Atlanta Braves, who bolstered a rotation that was depleted by injuries and disappointing performances. ''This is an upside play, no doubt about it,'' general manager Alex Anthopoulos said. Smyly earned a $1,481,481 prorated base salary from an original $4 million contract with the Giants, plus roster and performance bonuses.