Golden State Warriors forward Draymond Green was one of the thousands who celebrated Michigan State's upset victory against tournament favorite Duke.

Green, who himself spent four seasons with the Spartans, was one happy man following Michigan State's razor-thin 68-67 victory against Zion Williamson and company on Sunday night. Green was so pumped about the win that he decided to roast teammate and former Blue Devil Quinn Cook live on Instagram:

https://www.instagram.com/p/BvsTtbRB42P/

Cook played for Duke for four years between 2011 and 2015, and Green made sure to remind his teammate who the better team was on the evening.

Michigan State took the surprise victory behind the heroics of junior guard Cassius Winston (20 points, 10 assists, four steals) and sophomore forward Xavier Tillman (19 points, nine rebounds, three steals, two blocks). Despite outstanding performances yet again from Zion Williamson (24 points, 14 rebounds, three steals, three blocks) and RJ Barrett (21 points, six rebounds, six assists), the Spartans came together as a team to shock the Blue Devils.

This was indeed a total team effort that any Michigan State supporter would be proud of. This includes Dubs star Green, who himself had one heck of a career as a Spartan, averaging 10.5 points, 7.6 rebounds, and 2.9 assists in four seasons with the team.

Green had a pretty easygoing night with the Warriors, as they took care of business against the Charlotte Hornets on Sunday. The defending champs were ruthless against Kemba Walker and company, as the night ended with an extremely lopsided final score of 137-90 in favor of Golden State.