The Kolkata franchise have nine points from four matches to occupy the top spot, ahead of FC Goa (eight points).
Two-time champion Chennaiyin FC opened its account in ISL-6 with a goalless draw against Mumbai City FC in its first home game of the season at the Nehru stadium, in Chennai, on Sunday.
Norma Godinho challenges sporting know-it-alls.
The Sergio Lobera side now have six points from three matches, while SC East Bengal remained at the bottom of the table, yet to open their account in their debut ISL season.
ATK may have qualified for the play-offs, but the loss came as a big blow to their AFC Champions League qualifying aspirations with FC Goa taking a three-point lead at the top with only a match left for the league stage to conclude.
Summary of sports events and persons who made news on Monday
News of all that's transpired on and off the football field
Summary of sports events and persons who made news on Sunday.
Northeast United FC brightened their semi-final prospects with a 2-0 win over strugglers Mumbai City FC in the Indian Super League (ISL) match at Guwahati, helping the Highlanders move to fourth position in the pecking order.
Bengaluru FC will begin their I-League title defence against Shillong Lajong at home at Kanteerava Stadium in the inaugural game of the new season on January 7.
Hosts Mumbai City FC suffered their third defeat in a row after going down 0-2 to North East United FC in a lop-sided Indian Super League game, in Mumbai, on Wednesday.
NorthEast United FC were held to a thrilling 3-3 draw by Chennaiyin FC at the GMC Stadium, in Bambolim
Delhi Dynamos suffered a shock 3-4 defeat at the hands of Pune City FC in a thrilling match but still maintained their top spot at the points table in the Indian Super League football in Pune on Friday.
Mumbai City FC and their state rivals FC Pune City played out a goalless draw in the Indian Super League football tournament at the D Y Patil Stadium in Navi Mumbai on Friday.
Lucimar Ferreira da Silva, popularly known as Lucio, has signed up with FC Goa as a marquee player for the second season of the Indian Super League.
NorthEast United inched closer to a playoffs berth with a 2-1 win over 10-man SC East Bengal in the ISL
Just like MS Dhoni, his wife Sakshi is also a big football fan.
Sporting Clube de Goa produced a dominating display to beat debutants Aizawl FC 2-0 and earn their first win of I-League football in a round four fixture Aizawl on Monday.
The Indian cricketer also gave his thumbs up to ISL saying it could prove to be a blessing in disguise for the younger players in the country.
Cornell Glen struck twice as defending champions Mohun Bagan continued their winning run by notching up a convincing 3-1 win over Salgaocar FC to remain at the top of the table after the 9th round of the Hero I-League played at Tilak Stadium, in Vasco, on Saturday.
News of all that's transpired on and off the football field
Atletico de Kolkata were guilty of missing too many chances and were held to a goalless draw against FC Pune City in their concluding group encounter of Hero Indian Super League at Rabindra Sarobar Stadium, Kolkata, on Friday.
Defender Anas Edathodika and midfielder Eugeneson Lyngdoh emerged as costliest picks for an identical Rs 1.1 crore by new outfit Jamshedpur FC and two-time champions ATK respectively in the Indian Super League domestic players draft in Mumbai on Sunday.
In a letter signed by Swapan Sadhan Bose, managing director of Mohun Bagan, the I-League clubs have urged the prime minister to "intervene and save the sport".
National football team coach Wim Koevermans has announced his squad of 21 players for India's two international friendlies which are scheduled to be held this month.
All the results from the I-League and ISL matches played on Saturday.
Churchill Brothers Sports Club continued with their winning run in the I-League as they coasted to a 3-1 win over Mumbai FC, at the Nehru Stadium, Fatorda, Goa on Saturday.
Portuguese forward Goncalves opened the scoring in the 15th minute, before putting Chennaiyin two-up by converting a penalty in the 21st minute.
Chennaiyin FC rode on Jeje Lalpekhlua's 64th minute strike to beat Pune City FC by a solitary goal and book a semi-final spot in the Indian Super League football tournament in Pune on Saturday.
ATK now have 33 points as they remained firm in contention for the top-spot.
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Indian football team captain Sunil Chhetri on Monday tied the knot with long-time girlfriend Sonam Bhattacharya, daughter of Mohun Bagan legend Subrata Bhattacharya, at a grand wedding ceremony in Kolkata on Monday.
Hyderabad settled the tie in their favour in the second half through late goals from substitute Liston Colaco (85', 90').
Salgaocar Juniors defeated Mumbai FC in a keenly-contested final to emerge 'India Champions' in the Indian leg of the NIKE-Manchester United Premier Cup. In a close match, at the Bharti Vidyapeeth grounds in Pune on Tuesday, goalkeeper Aldrich Fernandes saved three scoring attempts by Mumbai FC Juniors (U-15) before the Goa-based club won the summit clash 5-4 via the tie-breaker.
News of all that's transpired on and off the football field
Images: Mohun Bagan get massive reception.
Sporting Clube de Goa continued their slow but steady progress in the I-League with a solitary goal victory over Dempo Sports Club at Duler Stadium, Goa, on Saturday.
Chapman was hospitalised on Sunday night in Bengaluru and passed away early Monday morning.
Arsenal legend Freddie Ljungberg and Spanish World Cupper Luis Garcia will be the centre of attention when Mumbai City FC kick off the inaugural Indian Super League football tournament on October 12 at Atletico de Kolkata, in a tournament that will feature 61 games spread across 70 days.
