This was Kerala Basters first win of the season.
Sunil Chhetri missed a penalty with the scores level, with Mourtada Fall and Ygor Catacau scoring the winners for Mumbai City FC.
Khassa Camara scored a late injury-time winner for NorthEast United against FC Goa.
Suvam Sen and Vishal Kaith stood out in both goals as the game finished goalless, despite 35 shots in total.
PLUS: Chennaiyin rely on their Indian core and NorthEast United are already in trouble - in this week's ISL musings.
Greg Stewart opened the scoring for Jamshedpur FC before Bart Ogbeche equalized for Hyderabad FC in the second half.
A 5-1 victory over ATK Mohun Bagan was not just a statement of intent, it was Mumbai City unveiling their new identity.
Vikram Pratap Singh scored a brace as Mumbai City destroyed title rivals ATK Mohun Bagan.
Odisha beat SC East Bengal 6-4 in a match that saw five goals scored after the 80th minute.
Anirudh Thapa's and Lallianzuala Chhangte's goals ensured Chennaiyin's perfect start to the season continued.
Ashique Kuriniyan put BFC in the lead before his own goal levelled things up.
Joao Victor, Bart Ogbeche and Rohit Danu scored for Hyderabad FC after Ahmed Jahouh gave Mumbai City FC the lead early on.
Antonio Habas' metamorphosis into a manager overseeing an attacking, fluid ATK Mohun Bagan left SC East Bengal in shreds in the Kolkata Derby.
Roy Krishna, Manvir Singh and Liston Colaco found the net as ATK Mohun Bagan dominated the Kolkata Derby.
Nerijus Valskis ended a long goal-drought, with Jordan Murray and Airam Cabrera also finding the net.
PLUS: Concerns reign for Bengaluru & Chennaiyin, while Odisha bring a welcome surprise - in this week's ISL musings.
Sahal Abdul Samad and Jorge Diaz missed gilt-edged chances to score.
Javi Hernandez scored a brace for Odisha FC, while Sunil Chhetri missed a penalty for Bengaluru FC.
Vladimir Koman scored Chennaiyin FC's winner from the spot in the 66th minute.
Igor Angulo scored a brace on debut for Mumbai City against his former side FC Goa.
Franco Prce's opener was cancelled out by Peter Hartley.
Bengaluru held the edge in an error-strewn, end-to-end match.
What should scare everyone else is the realisation that this display, all four-goals-and-17638-chances created, was ATK Mohun Bagan in second gear.
Hugo Boumous scored twice on debut, with Roy Krishna and Liston Colaco also amongst the goals for ATK Mohun Bagan.
Khalid Jamil is the first Indian head coach in the history of the Indian Super League.