LUSAIL, Qatar, Nov 22 (Reuters) - Unheralded Saudi Arabia notched one of the biggest shocks in World Cup history on Tuesday with a 2-1 win over Lionel Messi's Argentina thanks to a scintillating second half come back. But Saudi Arabia, the second-lowest ranked team in the tournament after Ghana, threw caution to the wind at the start of the second half, charging at Argentina's defence in front of a frenzied 88,012 crowd. Despite plenty of possession after that, Argentina were unable to penetrate Saudi Arabia, who were competing in their sixth World Cup but had never previously won an opening game. ", the green-clad Saudis chanted over and over in the Lusail Stadium, on their feet and greeting every clearance from their defence with a deafening roar. Reporting by Andrew Cawthorne and Shady Amir; Editing by Christian RadnedgeOur Standards: The Thomson Reuters Trust Principles.

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