ATLANTA — In a stunning end to one of baseball's longest runs, John Smoltz reached a preliminary agreement on a $5.5 million, one-year contract with the Boston Red Sox Thursday after failing to work out a deal to return for his 22nd season with the Atlanta Braves.

A person familiar with the negotiations, speaking on condition of anonymity because the Red Sox had yet to make an official announcement, said Smoltz can earn an additional $5 million in bonuses, some based on days on the active roster.

The deal is a subject to a physical, which is scheduled for Monday.