Malek Maaz helped end Japan hopes of a hat-trick of AFC Asian Cups with the livewire striker bagging a double as Saudi Arabia defeated the defending champions 3-2 in a see-saw semi-final at the My Dinh Stadium on Wednesday.

The Al Ahli forward scored the decisive goal in the 57th minute after the Saudis had twice squandered the lead. Yuji Nakazawa cancelled out Yasser Al Qahtani opener and Yuki Abe acrobatically drew Japan level after his defensive lapse allowed Malek Maaz to regain the Gulf side's advantage.

Japan and Saudi Arabia, both looking to win the competition for a fourth time, stuck with the same starting 11 that began their respective quarter-final victories over Australia and Uzbekistan and it was the defending champions who created the first chance of the match.

Yasuhito Endo and Shunsuke Nakamura exchanged passes at an eighth minute corner before the latter swung the ball into the six-yard area but the Celtic midfielder's cross was punched clear by Yaser Al Mosailem before it could reach the head of Yuji Nakazawa.

The Saudi keeper was called into action again seven minutes later when he blocked at the feet of Seiichiro Maki after Keita Suzuki had threaded the ball through to the JEF United striker.

Saudi Arabia, who had been distinctly second best in the opening exchanges, soon settled and in the 25th minute a shot from skipper Yasser Al Qahtani almost looped in after deflecting off the out-stretched leg of Nakazawa before Japan keeper Yoshikatsu Kawaguchi palmed away the resulting corner from Abdulrahman Al Qahtani.

The Al Qahtanis were both involved as the Saudis took a 35th minute lead, with Taiseer Al Jassam knocking down Abdulrahman free-kick in to the path of Yasser, who hooked the ball past Kawaguchi.

The Saudis had barely finished celebrating the sniper's fourth goal of the tournament when Japan levelled two minutes later as Nakazawa charged in front of Al Mosailem to head home an Endo corner.

Japan almost stole a second going into the break when Al Mosailem flapped at a Nakamura free-kick but the ball bounced just past the Al Ahli keeper right hand post.

Just two minutes into the second half the Saudis went ahead when Malek Maaz ghosted in between Nakazawa and Yuki Abe to nod in Ahmed Al Bahari pinpoint cross from the right.

But for a second time Japan hit back soon after and for a second time the equaliser came from an Endo corner.

The Gamba Osaka midfielder's 53rd minute flag kick was headed back across the penalty area by Seiichiro Maki and dispatched past Al Mosailem via an acrobatic scissors kick from Abe.

Abe had appeared to atone for his earlier defensive lapse but the Urawa Reds midfielder and Nakazawa were again culpable as the Saudis made it 3-2 four minutes later.

Malek Maaz took possession on the left side of the penalty box and easily skipped past the Japanese duo before unleashing a powerful drive beyond Kawaguchi.

Japan struggled to break down the Saudis but came within a lick of paint to drawing level with nine minutes left to play as substitute Naotake Hanyu, a 75th minute replacement for Endo, sending a thunderous long range drive crashing off the cross bar.

The victory helped the Saudis avenge their 1-0 defeat to the Japanese in the 1992 and 2000 Asian Cup finals and set-up a showdown in Jakarta with Iraq after Jorvan Vieira's side defeated Korea Republic 4-3 on penalties following their goalless draw in the other semi-final played earlier in Kuala Lumpur.