Persistent rains today forced cancellation of the practice sessions of both the Indian and Australian cricket teams on the eve of the third and final One-day at Margao in Goa.Groundsmen decided to cover the Jawaharlal Nehru stadium.Australia need to win tomorrow's match to square the three-match series.India had won the second match in Visakhapatnam to take a 1-0 lead while the first match was abandoned due to rains in Kochi.