The come-from-behind victory – in which Son scored the winner from the spot – ensured that the Taeguk Warriors finished the second round of Asian Qualifiers unbeaten, having dropped just two points from their six matches.

But, despite winning all three of their games and scoring 12 goals in the process since Group H resumed in early June, the Tottenham Hotspur forward believes there is plenty of room for improvement.

The Taeguk Warriors had all but secured top spot in Group H ahead of their final match against Lebanon at Goyang Stadium but prior to the game Portuguese coach Bento had highlighted the importance of rounding off the second round of Asian Qualifiers on a high.

While the East Asians dominated from the off, they fell behind to Soony Saad's 12th-minute goal before responding after the interval with Song Min-kyu's leveller and a penalty from Son Heung-min to ensure they finished six points ahead of second-placed Lebanon.

Needing a win at Goyang Stadium to guarantee progression, Lebanon opened the scoring against the run of play in the 12th minute through Soony Saad before Song Min-kyu levelled for the hosts six minutes after the interval.

Son Heung-min’s penalty put Korea in front midway through the second half and, with no further goals, the result means Lebanon will have to wait until the remaining teams in the Asian Qualifiers close out their campaigns on Tuesday to find out if they advance to the next phase as one of the five best runners-up.

The Syrians have already secured top spot in Group A but Li Tie’s team will be looking to take all three points to boost their chances of claiming one of the runners-up places available in the final round of the Asian Qualifiers when they meet at the Sharjah Stadium on Tuesday.

Five places are available to second place finishers with the best records across the eight groups after FIFA World Cup hosts Qatar, who cannot advance to the next round as a result, topped Group E.

In a tightly contested game, Saudi Arabia were made to wait until the final 10 minutes at King Saud University Stadium before they could finally unlock a resilient Singaporean defence. But when it rained, it poured as Salem Al Dawsari, Fahad Al Muwallad and Saleh Al Shehri all found the back of the net after the 83rd minute.

Vietnam's resilience saw them edge Malaysia 2-1 to remain firmly in the driver's seat to win Group G and earn a ticket to the final round of the Asian Qualifiers for the FIFA World Cup Qatar 2022.

Sitting on 17 points, two ahead of hosts United Arab Emirates heading into their clash on Tuesday, Vietnam only need to avoid defeat to book their spot in the final round.

Team Melli made it three wins in as many matches in Riffa with a 10-0 defeat of Cambodia on Friday to set up a cracker finale against Iraq.

With Iraq - on 17 points - two ahead of Iran, victory is the only option for Skocic's side in their bid to qualify for their third consecutive FIFA World Cup Finals.