Hopman Cup dates and teams

Hopman Cup, Perth Arena, Dec 30-Jan 6

Format: mixed teams (men's singles, women's singles, mixed doubles)

Prize money: $1 million

2017 champions: France (Richard Gasquet and Kristina Mladenovic)

GROUP A (rankings in brackets)

Germany - Alexander Zverev (4), Angelique Kerber (21)

Canada - Vasek Pospisil (108), Eugenie Bouchard (83)

Belgium - David Goffin (7), Elise Mertens (36)

Australia - Thanasi Kokkinakis (209), Daria Gavrilova (25)

GROUP B

Switzerland - Roger Federer (2), Belinda Bencic (74)

USA - Jack Sock (8), Coco Vandeweghe (10)

Russia - Karen Khachanov (45), Anastasia Pavlyuchenkova (15)

Japan - Yuichi Sugita (40), Naomi Osaka (68)