However, the 6? 11 striker, known as 'Greek Freak', has revealed that he has gained 51 pounds of strength since joining the NBA.
The 24-year-old helped the Bucks win at the TD Garden in Massachusetts, finishing the night with 30 points, eight rebounds, five assists and three blocks.
The victory extended the Bucks' winning streak to four games, which in turn saw Celtics succumb to their third straight loss.
The Bucks' lead was small throughout the third quarter, with Boston cutting the gap to one digit.
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Jaylen Brown led the Browns with 21 points at the bench.
But every time the Celtics cut the deficit, Milwaukee turned to Antetokounmpo, Khris Middleton or Tony Snell to keep them under control.
The Bucks increase their record to 22-9 and remain second behind leaders of the Eastern Conference, the Toronto Raptors.
Bucks coach Mike Budenholzer admits the team depends a lot on their superstar.
"We're here with Giannis every day, every night," Budenholzer said.
"What he does, whatever you want to call it, he plays practically in every position for us and does everything."
Antetokounmpo's performances put him as an early favorite of the 2019 MVP award.
As Antetokounmpo developed, Middleton saw his role in the offense of the Bucks changing significantly.
"Getting here was kind of a new start, and I had to earn my place," Middleton said.
"So, by the time I am now, I still have that hungry mentality. I want to do great things, I still want to lead the team, but at the same time, you have to sacrifice certain parts of your game.
"A little bit of everything, but I know it's better for the team, so I do not take it personally.
"I accepted this role, I accept who I am as a player and as a person."
The Bucks are next in action on Saturday, where they face a trip to play Miami Heat in Florida.