India's campaign in men's and women's singles event in the Australian Open ends on a disappointing note with Somdev Devvarman and Sania Mirza loosing their respective first round matches today.Somdev lost to Tommy Robredo of Spain in straight sets 6-7 3-6 4-6, while Sania went down 7-5 3-6 1-6 to former World Number one and seven Grand Slams winner Justine Henin of Belgium.Defending champion Roger Federer entered second round of the Australian Open. Federer beat Slovakian Lukas Lacko 6-1 6-1 6-3. He will face either Gilles Simon of France or Taiwan's Lu Yen-Hsun in the next round.Top-ranked Nadal plays Marcos Daniel of Brazil in his opening match. In the women's draw, top seed Caroline Wozniacki beat Argentina's Gisela Dulko 6-3 6-4.