Serbia needed a champions tie-break in the deciding mixed doubles rubber to beat Australia after Novak Djokovic suffered a surprise defeat to Bernard Tomic in the Hopman Cup in Perth.
Djokovic lost in straight sets to Tomic and Serbia had to rely on Ana
Ivanovic to beat Ashleigh Barty before edging to a 2-1 win in a tight mixed doubles rubber.
Tomic never really looked in trouble against the world No 1 and an upset in Group A looked on the cards. But Ivanovic made short work of her young opponent and eased to a 6-2 6-3 victory.
Nikolay Davydenko has reached the
Qatar Open quarter-finals by beating fourth-seeded
Mikhail Youzhny 7-5, 6-3.
Davydenko, ranked 44th in the world, has struggled in recent years with injury, but is targeting a place in the top 20 this year.