Bucks teammates got Giannis Antetokounmpo pens for his birthday to encourage him to sign extension | CBS Sports Headlines Bucks teammates got Giannis Antetokounmpo pens for his birthday to encourage him to sign extension Giannis has until Dec. 21 to sign his supermax extension, or he will become a free … Continue reading Bucks teammates got Giannis Antetokounmpo pens for his birthday to encourage him to sign extension