Detroit, of all teams, gave Boston the first true test of its nascent title defense, pushing the reigning champs to the brink at Little Caesars Arena. The Celtics squandered a 23-point lead and trailed with less than three minutes remaining before rallying to win 124-118 and remain undefeated on the young season. Jayson Tatum paced Boston with 37 points on 12-for-26 shooting, including 6-for-13 from 3-point range.