Jimmy Butler had 30 points and nine rebounds as the Chicago Bulls outlasted Boston 106-102 in Game 1 on an emotional day for grieving Celtics star Isaiah Thomas.

Playing a day after 22-year-old sister Chyna Thomas was killed in a car accident in their home state of Washington, Thomas led the top-seeded Celtics with 33 points.

Celtics fans rallied behind Thomas, showering him with a deafening cheer when he was introduced.

Butler scored 23 points in the second half. Bobby Portis finished with 19 points and nine rebounds for the Bulls.

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Al Horford had 19 points, eight rebounds and seven assists for Boston.

Game 2 in the first-round series is Wednesday in Boston.