My Tips:
Group A
Australia v Belgium 1-2
Alicia Molik v Justine Henin 1-6 1-6

Lleyton Hewitt v Steve Darcis 6-3 6-7 6-2
Molik/Hewitt v Henin/Darcis 2-6 6-4 3-10
Serbia v Kazakhstan 2-1
Ana Ivanovic v Yaroslava Shvedova 6-4 6-2
Novak Djokovic v Andrey Golubev 6-4 6-3
Ivanovic/Djokovic v Shvedova/Golubev 3-6 7-6 7-10
Belgium v Kazakhstan 2-1
Justine Henin v Yaroslava Shvedova 6-2 6-1
Steve Darcis v Andrey Golubev 2-6 6-1 6-7
Henin/Darcis v Shvedova/Golubev 3-6 6-4 10-8
Serbia v Australia 3-0
Ana Ivanovic v Alicia Molik 6-1 6-0

Novak Djokovic v Lleyton Hewitt 7-6 7-6
Ivanovic/Djokovic v Molik/Hewitt 6-4 6-4
Australia v Kazakhstan 1-2
Alicia Molik v Yaroslava Shvedova 4-6 3-6
Lleyton Hewitt v Andrey Golubev 6-4 7-5
Molik/Hewitt v Shvedova/Golubev 3-6 7-5 7-10
Serbia v Belgium 3-0
Ana Ivanovic v Justine Henin 7-5 6-7 7-5
Novak Djokovic v Steve Darcis 6-4 6-4
Ivanovic/Djokovic v Henin/Darcis 6-4 6-7 11-9