Alireza Jahanbakhsh's last-minute penalty gave Iran a 2-1 win over Japan, and a semi-final against Asian Cup holders and hosts Qatar will be their reward.

Jahanbakhsh kept his cool in the 96th minute to keep three-time Asian Cup winners Iran on course for a first title since 1976.

Iran came from behind after Hidemasa Morita put pre-tournament favourites Japan ahead in the first half of an entertaining quarter-final at Education City Stadium.

But Mohammad Mohebi levelled the score in the 55th minute to pave the way for Jahanbakhsh's late heroics.

Iran's win was made even more impressive considering they were without star striker Mehdi Taremi, who was suspended.

Qatar, meanwhile, are in with a chance of retaining the title after they defeated Uzbekistan on penalties following a 1-1 draw at Al Bayt Stadium.

Utkir Yusupov's own goal put Qatar ahead midway through the first half, but Uzbekistan rallied after the break – Odiljon Hamrobekov's effort enough to send the tie to extra time and eventually penalties.

Almoez Ali and Almahdi Ali both failed to convert for Qatar in the shoot-out, but Jaloliddin Masharipov's miss set the stage for Pedro Miguel to be Qatar's hero.

Iran will take on Qatar on Wednesday, a day after South Korea go up against Jordan.

Jurgen Klinsmann overcame Roberto Mancini as South Korea advanced to the quarter-finals of the Asian Cup on penalties after a dramatic draw against Saudi Arabia on Tuesday.

South Korea won 4-2 in the shoot-out after the round-of-16 match had ended 1-1 after extra time.

Defeat will be particularly hard for Mancini to take as Saudi Arabia led 1-0 deep into stoppage time at Education City Stadium through Abdullah Radif's 46th-minute strike.

Cho Gue-sung levelled the game in the 99th minute to send it into an additional period, then South Korea goalkeeper Jo Hyeon-woo was the hero in the shoot-out when saving penalties from Sami Al Naji and Abdulrahman Ghareeb.

Hwang Hee-chan converted the winner from the spot to send his country through to the last eight and a match against Australia on Friday.

Uzbekistan are also into the quarter-finals after beating Thailand 2-1, setting up a clash with hosts and defending champions Qatar.

Azizbek Turgunboev put Uzbekistan ahead in the 37th minute, controlling Diyor Kholmatov's diagonal pass on his chest and volleying low past Patiwat Khammai.

Thailand equalised through Supachok Sarachat's curling effort from outside the box 13 minutes after half-time, but it took just seven more minutes for Uzbekistan to regain the lead with what proved to be the decisive goal from Abbosbek Fayzullayev, who struck from distance to beat Khammai.

Australia are up and running in the Asian Cup after second-half goals from Jackson Irvine and Jordan Bos broke India's resistance and secured a 2-0 win.

The 2015 champions are out to reclaim the title in Qatar and were given an early test against a stubborn opponent and a raucous crowd at Ahmad bin Ali Stadium.

Australia dominated the Group B match, but struggled to find a way through India's determined defence until goalkeeper Gurpreet Singh Sandhu failed to claim a high cross from Martin Boyle five minutes after the break and Irvine pounced to fire home from close range.

Bos, a substitute, had only been on the field for a minute when he converted Riley McGree's low cross at the far post to double the lead in the 73rd.

"We can improve on everything and the boys know that," Australia coach Graham Arnold said. "We have our standards and I have high expectations of the players and their performances and those expectations and standards need to be met."

The match was the first in the history of the Asian Cup to be officiated by a female referee, with Japan's Yoshimi Yamashita in charge.

Australia are two points clear at the top of Group B thanks to a 0-0 draw between Uzbekistan and Syria.

Uzbekistan are hoping to be the main challenger to Australia, but they failed to make their pressure count at the Jassim bin Hamad Stadium.

Syria looked to have taken the lead in the second half through Ibrahim Hesar, only for the goal to be ruled offside.

In Saturday's early match, Tajikistan, making their Asian Cup debut, held China to a 0-0 draw in Group A.

Alisher Dzhalilov came close to putting Tajikistan ahead in the first half, while China's Liu Binbin had a shot cleared off the line after the break and Zhu Chenjie saw a goal ruled out by VAR.

Reigning champions Qatar top Group A after a 3-0 win over Lebanon on Friday.