The United States opened their Hopman Cup campaign in style with a 3-0 win over the Czech Republic in Perth on Sunday. The American pair of Jack Sock and Coco Vandeweghe won both their singles matches to clinch the tie, and then made it a clean sweep with victory in the mixed doubles.
After Vanderweghe beat Lucie Hradecka 6-4, 6-2 to open the tie, Sock then edged past Adam Pavlasek in three sets.
The dead mixed doubles rubber was a relaxed affair played under the novel Fast Four format and the US came from a set down to win 2-4, 4-2, 4-1.
Sock, who is just one place in the rankings below last year's career-high of world number 22, traded winners with the inexperienced Pavlasek in the first set.
A break in the 11th game of gave Sock the advantage and the 24-year-old served out to clinch the set.
However, the 75th-ranked Pavlasek broke in the second game of the second set and fought back to level the tie.