The Celtics clamped down on Antetokounmpo all game and cruised past the Bucks, 112-90.
"Our focus was to make sure that we just made it tough on him every time, just making sure he earned everything he got," Horford said. "I felt like we did a pretty good job of that."
Kyrie Irving had 26 points and 11 assists, tying his playoff career high, and Horford added 20 points and 11 rebounds to pace Boston, which controlled the game for long stretches while playing stingy defense against Antetokounmpo.
Jaylen Brown chipped in with 19 points and Gordon Hayward had 13 off the bench for the Celtics.
Antetokounmpo scored 22 points but shot just 7 for 21. He didn't make his first field goal until the first minute of the second quarter.
"It was one of the toughest losses we've ever had, all season, especially at home," Antetokounmpo said.
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