This was Dynamos’ second win in three outings, while the Pune suffered their first defeat at home at the Balewadi Stadium.
Pune will look to use their home conditions to best effect and hold on to their winning momentum against NorthEast United
Dynamos lost their first match of the tournament away against FC Goa 0-2 while Chennaiyin were beaten 2-3 at home by title holders Atletico de Kolkata.
Delhi began their campaign with a 0-2 loss against FC Goa on 4 October despite controlling the match in patches and having come close to scoring on a few times.
ATK took the lead early when Man-Of-The-Match Arata smartly side-volleyed a Javi Lara cross from the right flank in the 13th minute.
The lead was doubled when former India striker Mohammad Rafi headed one in the 68 minute.
ATK will hope to ride on that confidence to win again on Wednesday after a morale-boosting victory in the opening match.
The Tendulkar co-owned was impressive in the inaugural edition, reaching the final, later stopped by Atletico de Kolkata; Northeast will bank on its new Manager
After finishing the first season in the bottom half of the points table, both Mumbai and Pune have made good use of this year’s auction process.
Besides Rajinikanth and Sachin, Bollywood stars Abhishek Bachchan, Aishwarya Rai Bachchan, Arjun Kapoor and Alia Bhatt were also present at the event.
FC Goa started their ISL football campaign on a convincing note after dispatching Delhi Dynamos 2-0 at the Nehru Stadium, Fatorda in Margao on Sunday.
Postiga struck once in each half, while Frenchman Valmiro Lopes Rocha (Valdo) was the other scorer for the winners at the packed Jawaharlal Nehru Stadium.