Hamilton - The Chiefs slumped to an upset 20-17 loss against the Highlanders on Friday after star centre Sonny Bill Williams conceded a last-minute penalty.
The Chiefs, early-season pace-setters in this year's Super 15, dominated possession and territory but failed to make it count, their first defeat in four matches.
Attempts to repeat the slick attacking moves that saw them defeat seven-time champions the Crusaders last week repeatedly faltered as the Chiefs' star-studded backline had an off night.