India will reach the top of the ICC Test Ranking for the first time if they win the third and final Cricket Test against Sri Lanka which begins in Mumbai on Wednesday. India lead the series 1-0 after thumping Sri Lanka by an innings and 144 runs in last week's second Test in Kanpur and have been given an added incentive to make it 2-0. India is currently third on the world rankings behind South Africa and Sri Lanka. However, the Indian skipper Mahendra Singh Dhoni has said that his team was not giving much thought to the prospect as it would not let the side focus on the task at hand. India's chances of beating the Sri Lankans have already suffered a blow with in-form opener Gautam Gambhir, the world's top-ranked batsman, pulling out of the match to attend his sister's wedding. He is expected to be replaced by Murali Vijay, who played his only Test against Australia last year. Although they cannot win the series, the Sri Lankans are eyeing their own slice of history and are putting their faith in spinner Muttiah Muralitharan. Sri Lanka captain Kumara Sangakkara remains confident Muralitharan can recover and play a starring role in what will be his final Test away from home.