India are on the threshold of becoming the number one team in Cricket Test rankings as they closed in on an emphatic victory in the third and final Test against Sri Lanka despite captain Kumar Sangakkara's gritty unbeaten century at Mumbai yesterday. Sangakkara 133 and Nuwan Kulasekara 9 were at the crease. The Lankans are still trailing by 59 runs at the end of the day yesterday. After conceding a mammoth 333-run first innings lead, the visitors were struggling at 274 for six at close on the penultimate day.The Indians, on the other hand, will look to wrap up the remaining four wickets quickly today and clinch the three-match Test series with a 2-0 margin.