Lionel Messi found himself at the centre of controversy during Argentina's World Cup opener against Algeria after avoiding punishment for a challenge on Aissa Mandi.The Argentina captain later went on to score a hat-trick as the reigning champions began their title defence with a comfortable 3-0 victory in Kansas City.However, Messi's display was overshadowed for some supporters by an incident in the first half involving Algeria defender Mandi.The 38-year-old appeared to catch the back of Mandi's calf and Achilles area while attempting to challenge for the ball, leaving the defender requiring treatment.TRENDINGStoriesVideosYour SayReplays prompted debate among viewers, with some suggesting Messi was fortunate not to receive at least a yellow card.Polish referee Szymon Marciniak took no action and play resumed, while there was no indication that VAR had recommended an on-field review.The decision sparked a fierce reaction on social media, where a number of supporters questioned why the Argentina star had not been cautioned.One fan wrote: "If that was any player besides Messi it would've been red."Another posted: "I love Messi, but he should have got a red there. Not even a yellow card is wild."A third supporter added: "That should be a red card. Messi stamped on his calf. What are we doing?"One viewer was particularly frustrated, writing: "Messi escaping red. No VAR check. Jesus. Just give Argentina the trophy."Despite the controversy, Messi ensured Argentina began their title defence in emphatic fashion.LATEST SPORTS NEWS:Lionel Messi gives emotional speech after making World Cup history in Argentina win over AlgeriaBBC axes legendary Wimbledon pundit from lead commentary coverageHarry Kane and other England players tricked into signing document ahead of Croatia World Cup clashHe opened the scoring in the early stages before adding two more goals after the interval to complete a memorable treble.The hat-trick saw Messi move level with former Germany striker Miroslav Klose on 16 World Cup goals, leaving him within touching distance of becoming the outright leading scorer in the competition's history.It was also another milestone evening for the Inter Miami star, who won his 200th cap for Argentina and extended his record tally to 27 World Cup appearances.Messi's three-goal haul came exactly 20 years after his World Cup debut against Serbia and Montenegro in Germany, a match in which he also found the net.Argentina manager Lionel Scaloni was once again left marvelling at his captain's brilliance."At a loss for words about Leo," Scaloni said."What can I say? He's incredible."Everyone in football wants to see him and enjoys it."The victory puts Argentina in a strong position in Group J ahead of meetings with Austria and Jordan, while Messi's pursuit of further history shows no sign of slowing down.Our Standards: The GB News Editorial Charter