Ismaeel Abdulatif scored four goals as 10-man Bahrain demolished India at Al Sadd Stadium to send Bob Houghton's side out of the Asian Cup.
Faouzi Aaish opened the scoring in the sixth minute but India responded just three minutes later through Gouramangi Singh.
Abdulatif then opened his account after 19 minutes and grabbed another three minutes later before sealing his hat-trick 10 minutes before the break.
Sunil Chhetri pulled another goal back early in the second half and, although Bahrain had Aaish sent off just after the hour, they scored a fifth through Abdulatif.
A win for Bahrain in their final Group C game against Australia will send them through to the quarter-finals.
India started the match with brightly and only an acrobatic one-handed save by Mahmood Mansour from Chhetri's first-time volley denied them the lead after three minutes.
Despite their early endeavour, it was Bahrain that took the lead in the eighth minute as Aaish was felled inside the area by Climax Lawrence and the referee had no hesitation in awarding a penalty.
Aaish stepped up to fire home from the spot with goalkeeper Subrata Paul diving the wrong way.
But Bahrain were ahead for a matter of minutes as a long ball from midfield was aimed towards Abishek Yadav and the forward rose to head towards goal where Gouramanghi Singh was on hand to stab the ball home.
The frenetic pace of the game continued as Bahrain regained the lead in the 19th minute as a cross from Aaish deflected off the legs of Paul and the ball fell kindly for Abdulatif, who side-footed a shot into the empty net.
Things got even better for Bahrain three minutes later when Paul rushed out in attempt to collect Jaycee John's cross but failed to get to the ball and Abdulatif was once left with another easy finish.
Bahrain were running riot and the expected fourth arrived 10 minutes before the break with Abdulatif completing his hat-trick, running onto a through ball and then driving home.
India came out fighting after the break and halved the deficit seven minutes into the second half.
Renedy Singh unleashed a rasping drive that struck the underside of the crossbar and, although it appeared to bounce over the line, Yadav hit the follow-up against the woodwork before Chhetri finally headed the ball into the back of the net.
Aaish was then needlessly sent off for Bahrain just after the hour after earning his second yellow card for a dive in the area before they wrapped up the scoring 13 minutes from time through the impressive Abdulatif.
Bahrain coach Salman Sharida praised the fighting spirit of his players after a
5-2 rout of India at Al Sadd Stadium put them back in contention for a place
in the quarter-finals of the Asian Cup.
"We lost the first match against Korea Republic and the game against India was
important for us,'' said Sharida. "We needed a win tonight and that's what we
tried to get.
"We had fighting spirit and scored from the chances that we had and we almost
had the game won by the end of the first half.
"At half-time I warned the players that our opponents would come out fighting
and in the second half India nearly threatened a comeback. But at the end of the
night we got the three points and that's the most important thing for us.''
The defeat for India confirmed their exit from the Asian Cup, but coach Bob
Houghton admitted it has still been a valuable experience for his players.
"This tournament is good for us for two reasons,'' he added.
"The first reason is that it shows that our federation and sports authorities
need to step up and we need to have more infrastructure. The second one is that
I believe it is good for the profile of football in India and it will be helped
"Many people are watching the matches of the Asian Cup and playing against
such teams as Australia and Bahrain is good for Indian football.''