England ascended to the top of the rankings courtesy of a 4-0 home win over India last summer but are in danger of slipping from top spot already following a 3-0 series defeat against Pakistan and a 75-run loss in Galle last week.
The second Test of the series gets under way in Colombo today.
Spotted: Virat Kohli, Anushka Sharma and other celebs at Mumbai airport
Photos: Salman Khan's 'special friend' Iulia Vantur at a song launch
Photos: Hrithik Roshan, Anushka Sharma, other celebs dazzle at event
In Pictures: Sex scandals involving Indian politicians
Photos: Abhishek Bachchan and Farah Khan at Boman Irani's birthday bash