Lionel Messi was on target as Argentina warmed up for the World Cup with a 5-0 rout of the United Arab Emirates in Abu Dhabi.Manchester City forward Julian Alvarez opened the scoring after being teed-up by Messi in the 17th minute before Angel Di Maria netted a quick-fire brace.Messi then struck his 91st goal for his country and Joaquin Correa added a fifth on the hour mark as one of the favourites for the tournament in Qatar played their final match before the Group C opener against Saudi Arabia on Tuesday.Croatia, runners-up in 2018, won Wednesday night's only match featuring two Qatar-bound countries as they edged out Saudi Arabia 1-0 in Riyadh.The cagey contest was finally settled in the 84th minute when substitute Andrej Kramaric struck the winner.Niclas Fullkrug’s debut goal earned Germany a 1-0 victory over Oman in Muscat.The 29-year-old Werder Bremen forward was teed-up by Chelsea’s Kai Havertz to score the only goal with 10 minutes remaining.Borussia Dortmund forward Youssoufa Moukoko, at 17 years and 361 days old, became Germany’s youngest debutant since 1954.England's opening opponents Iran were beaten 2-0 by Tunisia in Doha.Naim Sliti netted a 62nd-minute penalty after a handball from Iran's Abolfazl Jalali, who was sent off, and defender Ali Abdi added a second seven minutes later.Poland left it late to clinch a 1-0 victory over Chile in Warsaw.It was a closely-fought battle, but neither side could find a breakthrough until Krzysztof Piatek fired home following a corner with five minutes left.Elsewhere, Qatar-bound Mexico were beaten 2-1 by Sweden in Spain.Training injury scares for BrazilNewcastle midfielder Bruno Guimaraes and Manchester United defender Alex Telles suffered injury scares in the first full