Having finished second in pool D, behind England basis goal difference, an unbeaten India are optimistic ahead of the crucial match, which yet again promises to be a house-full affair with tickets for the match being sold out.
The 26-year-old scored four goals, all of which came in a stunning first 20 minutes, to take his already phenomenal goals tally to 126 goals from 133 internationals.
India coming second in the pool means that they will have to play the crossover match against New Zealand on Sunday in order to qualify for the quarter-final.
If India top their pool then they will not have to play the cross over match and moreover they will face a relatively easier opponent in quarter-final.
The 2014 US Open champion Cilic, who received a bye in the opening round, made a dominating start in the match and took the first set without breaking a sweat
Ramkumar Ramanathan and Miguel Angel Reyes-Varela now face the three-time Grand Slam champions Rajeev Ram and Joe Salisbury, who overcame the challenge from Sebastian Baez-Luis David Martinez 6-3, 7-6 (1) in their opening encounter.
The 25-year-old Nagal is the second wild card entrant in the singles main draw after Mukund Sasikumar. Nagal featured in the French Open and US Open qualifiers earlier this year and also reached the quarter-finals of the ChallengATPer event in Germany in August