By FOX Sports staff
Following a goalless first half at the Salt Lake Stadium, the hosts found the breakthrough in the 71st minute when veteran Japanese playmaker Ryuji Sueoka netted.
With neither side able to grab another goal, it is East Bengal who will now travel to Padang for next week’s return encounter with the slenderest of leads.
Over at the Galolhu National Stadium, defending champions Kuwait SC took a huge step towards the semi-finals by recording a comprehensive 7-2 victory over Maldives’ New Radiant.
The visitors got off to a dream start when Rogerio slotted home the opener after just two minutes, before Chadi Hammami made it 2-0 in the 15th minute with a neat header.
Issam Jemaa then nodded home a third five minutes later, before converting two excellent crosses by Rogerio to hand his side a five-goal lead by the 34th minute.
The contest was all but over a minute before the break when Jemaa grabbed his fourth of the evening, but to New Radiant’s credit, they refused to give in and pulled one back in the 54th minute when Ali Fasir scored from a tight angle.
The hosts’ talismanic striker Ali Ashfaq then wasted an excellent chance when he fired wide from a penalty in the 64th minute, but made amends four minutes later when he netted to make it 6-2.
But the evening truly belonged to Kuwait and it was them who had the final say as Hammami scored from the spot eight minutes from time to round off the scoring.
There was however still time for late drama as both sides were reduced to ten men in injury-time after New Radiant's Mohamed Umair and Kuwait's Abdulhadi Khamees received their marching orders following an altercation.
Kitchee have plenty to do if they are to make the semis after being beaten 2-1 by ten-man Al Faisaly at the Mong Kok Stadium.
The Jordanian outfit opened the scoring in the 20th minute when Tulio Souza coolly scored from a one-on-one situation, but the hosts hit back three minutes before the hour mark when Ibrahim Al-Zawahreh netted an own-goal.
But two minutes later, Ra’ed Al Nawateer struck to restore Al Faisaly’s lead, which they managed to hold on to despite having had to play almost half an hour with ten men following the dismissal of Mohammad Khamees.
In Tuesday's final game, Kuwait's Al Qadsia were held to a 0-0 draw by Syrian outfit Al Shorta at the Al-Sadaqua Walsalam Stadium.
Tuesday’s AFC Cup Quarter-final 1st Leg Results
New Radiant 2-7 Kuwait SC
East Bengal 1-0 Semen Padang
Al Qadsia 0-0 Al Shorta
Image courtesy of East Bengal FC