Korou Singh had put India ahead in the 12th minute before Angel Blanco equalised in the 24th. Luis Kawecki put the Spaniards in the lead on the 26th, before an own goal by Pramveer gave them a two-goal lead just six minutes before the half-time break.
Aman Raj and Dharma were four shots behind the leader, Spaniard Manuel Elvira, who had a course record-setting 9-under 63 and was four shots ahead of the Indian duo, while Oliver Farr of Wales carded a bogey-free 8-under 64 to be second.
The Spaniard believes it is time for his team to put their best foot forward and deliver the necessary result in a game which is virtually a six-pointer in the race for the playoffs as FC Goa are just three points above Odisha FC in the table.
The 12-minute salvo from Guarrotxena took his goal tally for the season into double figures and propelled the Spaniard to the top of the goalscoring charts. The result also struck a blow to East Bengal FC's playoff hopes, and they now find themselves ten points off sixth place with five game
The Spaniard delivered in the crucial moments to secure a 7-5, 2-6, 6-4, 6-1 victory against 21-year-old debutante Jack Draper to reach the second round for the 17th time.
Amit Rohindas (12') and Hardik Singh (26') scored for India. In spite of Abhishek receiving a 10-minute yellow card in the final quarter, the Indian team held off the Spaniards and maintained a clean sheet.