Canada’s Eugenie Bouchard dropped just three games in a stunning win over world number one Serena Williams at the Hopman Cup in Perth.
Bouchard, the world number six, won 6-2 6-1 in 50 minutes to give Canada an early lead over the United States in the mixed team event.
Having required an on-court espresso to get her going in her opening match Williams again looked sluggish.
The American will play Lucie Safarova of the Czech Republic in her next singles match on Thursday.
Bouchard enjoyed her first-ever win against Williams, and joked afterwards: “Maybe she needed another coffee.
Vasek Pospisil later beat John Isner 6-3 7-6 (7-4) to give Canada an unassailable 2-0 lead over the US, before Williams and Isner took the mixed doubles 6-3 7-5.
World number two Maria Sharapova began her 2015 campaign with a crushing 6-0 6-1 win over Kazakhstan’s Yaroslava Shvedova in Brisbane.