Marcello Lippi's Guangzhou Evergrande remained on a treble trophy course Wednesday when they breezed past Lekhwiya of Qatar to reach the Asian Champions League semi-finals.

The Chinese side won 4-1 in Doha to complete a comfortable 6-1 aggregate win in their last-eight clash and become the first club from China to get to the semi-finals in eight years.

It was their South American front men who once again did all the damage.

Dario Conca and Elkeson, who were both on target in the first leg last month, scored in the 14th and 16th minutes respectively to put their side comfortably in control.

Muriqui added a third in the 31st minute to take his tournament tally to nine.

The Qataris grabbed a consolation in the 50th minute through South Korean midfielder Nam Tae-hee.

But Elkeson claimed his second -- and his side's fourth -- in the 72nd minute.

Lippi's men have three trophies in their sights.

They hold a 14-point lead in the Chinese Super League and have reached the domestic cup semi-finals.

A last-gasp goal sent South Korean champions FC Seoul into their first AFC Champions League semi-final but there was heartbreak for plucky Thai outfit Buriram United.

Montenegrin striker Dejan Damjanovic's 89th-minute strike was enough to settle a scrappy 1-0 win for FC Seoul over Saudi Arabia's Al Ahli for a 2-1 victory on aggregate.

FC Seoul have twice crashed out in the quarter-finals, although they were runners-up in the last edition of the tournament's precursor, the Asian Club Championship, in 2002.

Meanwhile Buriram sent their fans into a frenzy at a packed Thunder Castle Stadium when Spanish defender Osmar Barba scored in the first half against Esteghlal, levelling the tie at 1-1 after last month's 1-0 loss.

But Hanif Omranzadeh nodded home a far-post header to put Esteghlal back on top, before Andranik Teymourian made it 2-1 on the night and 3-1 on aggregate with a thunderbolt in stoppage time.

In Seoul, the hosts repeatedly threatened from dead-ball situations in the first half and defender Kim Jin-Kyu set the tone when he headed over from an early corner.

Captain Ha Dae-Sung fired a free-kick straight at goalkeeper Abdullah Al Muaiouf, who was then fully extended by a long shot from Colombian Mauricio Molina.

Mustafa Al Bassas thrashed a powerful strike into the side-netting in one of the best moments from Al Ahli, last year's runners-up, before Molina and Kim Ju-Young both headed over.

South Korean international Cha Du-Ri, who earlier took a boot to the face, had the closest moment of the opening half when his looping header over Al Muaiouf bounced back off the crossbar.

Damjanovic clinched it in the 89th minute when he was set free in the box and took full advantage, despite a poorly hit shot, as the ball bounced clumsily into the net.

Over in Thailand, Esteghlal threatened in the first five minutes through Teymourian's snap-shot, but it was Buriram who had the better of the first half.

And the hosts' hard work paid off eight minutes from half-time when Spanish centre-back Osmar rose unmarked at a corner and planted a downward header which levelled the tie 1-1 on aggregate.

However, Esteghlal came alive in the second half and there was no surprise when they grabbed the vital away goal on 53 minutes, when Teymourian's stabbed cross was met at the far post by Omranzadeh.

And in injury time, Iranian international Teymourian dispossessed Buriram's Theerathon Bunmathan in a central position and buried a scorching shot from fully 30 yards.

Later, Japan's Emperor's Cup-holders Kashiwa Reysol are locked at 1-1 with Saudi Arabia's Al Shabab ahead of the second leg in Riyadh.