What happened: The Atlanta Braves claimed left-handed pitcher Mitchell Parker off waivers from the Washington Nationals on Monday. The transaction moves the left-hander between National League East rivals as clubs begin adjusting their 40-man rosters for the winter.

Why it matters: Securing Parker provides Atlanta with cost-controlled left-handed pitching depth without yielding draft capital or trade assets. For Washington, parting with the southpaw opens a vacancy on the 40-man roster ahead of upcoming offseason roster deadlines.

What to watch: Parker slots onto Atlanta's 40-man roster as the club evaluates pitching depth entering the winter. Washington will look to reallocate the open roster spot before winter transaction freezes.