India have a great chance to achieve the rare feat of becoming no.1 in all 3 formats (irrespective of other team's performance) after 1st T20I against NZ on 1st Nov'17.
Conditions are:
*They win both the remaining ODIs against Aussies (If they lose, SA need to lose same number of matches against Ban).
*They should win next 4 T20Is (3 against Aus, 1 against NZ).