Babar and Malik hit unbeaten fifties in a 174 chase to condemn Sri Lanka to their 11th successive loss.
With Brendan Taylor and Kyle Jarvis back, the home side looks stronger than before and could make life tough for Windies.
Babar, Mushfiqur, Lakmal and Phehlukwayo among others to gain in latest rankings.
Pakistan took an unassailable 3-0 lead in the five-match series with 7-wicket win for Pakistan over Sri Lanka.
Andile Phelukwayo and Imran Tahir excelled for South Africa picking 7 wickets between them and won 2nd ODI by 104 runs.
Left-arm pacer inclusion in 16-man squad for the three matches against Sri Lanka is subject to being declared fit.
CSA named all-rounder Robbie Frylinck as a new cap in the Standard Bank Proteas T20 International squad for the two-match series against Bangladesh
Among the countries to participate in the World Cup qualifiers are West Indies, Afghanistan, Ireland and the hosts Zimbabwe themselves.
Hong Kong to battle it out with Scotland, Kenya for the final two positions.
Tharanga century in vain as Pakistan extend 2-0 lead with another Sri Lanka top-order batting collapse.