Serbia's Hopman Cup team, Ana Ivanovic and Novak Djokovic, have gone undefeated so far in Hopman Cup competition. Serbia has won all three rubbers against both Australia and Kazakhstan, and will face the team from Belgium next. Belgium, however, would have to win all three rubbers in order to keep Group A team Serbia out of the final, and that isn't likely to happen.
Group B consists of Italy, France, Great Britain, and the USA. In women's singles, the USA's Bethanie Mattek-Sands has defeated both Kristina Mladenovic of France and Italy's Francesca Schiavone. Mattek-Sands' defeat of Schiavone is her first top-10 win (though the Hopman Cup tournament is not part of the tour).
Kazakhstan waa originally represented by Yaroslava Shvedova, but she injured her right knee in the first rubber when she played Ivanovic, and she was replaced by Sesil Karatantcheva. Shvedova is currently in rehab for her knee injury.