The biggest debate in modern football is who is the best player in the world – Lionel Messi and Cristiano Ronaldo?However, both the players have experienced contrasting start to the 2018 World Cup.While Ronaldo scored an impressive hat-trick on Friday to help Portugal secure a crucial 3-3 draw against Spain, Messi put up a frustrating display against Iceland on Saturday as Argentina were held to a 1-1 draw.Things went from bad to worse for Messi against Iceland when he squandered the golden opportunity to put Argentina in front as his weak penalty kick was easily saved by Hannes Halldorsson.The mistake provided the perfect opportunity to Ronaldo’s fans as the Barcelona striker was roasted on Twitter. The social media users also taunted the forward for not performing under pressure.Lionel Messi is ready to retire, again.Dex Glennza (@dexglenniza) June 16, 2018Im no expert but: Ronaldo scored three goals against maybe the best team in the world, Messi got played to a stalemate by a nation smaller than Staten Island. #WorldCup18Mike Greenberg (@Espngreeny) June 16, 2018Messi-Ronaldo debate will go on eternally, but I think in last 24 hours, God has weighed in which side of the argument she favors pic.twitter.com/ui1cXx2rp1roger bennett (@rogbennett) June 16, 2018Choke job artist Messi strikes again!!! Ronaldo the goat!SCHOLES (@iamscholes) June 16, 2018Ronaldo wins a penalty, steps up, scores.Messi wins a penalty, steps up, misses.Ronaldo wins a free kick, steps up, scoresMessi wins a free kick, steps up, fires over the bar.Legends of the game.advertisementDanny WelBeast (@WelBeast) June 16, 2018The internet is a bad placeSee what they did to Messi pic.twitter.com/rhVN31MGbvUg Nke G (@t_riumphant) June 16, 2018Cristiano Ronaldo vs SpainScored a penaltyScored a free-kickCompleted a hattrickLionel Messi vs IcelandMissed a penaltyMissed several free-kicksFailed to score pic.twitter.com/dtgAT7onI2Football Vines (@FootballVines) June 16, 2018Messi: Anyone can score a penalty.Ronaldo: Take, come and score.#WorldCup #ARGISL pic.twitter.com/NRFhwkb5AxIyá Lájè Of Lagos (@newscantell) June 16, 2018Sergio Aguero scored to give Argentina the lead before Finnbogason swept home a loose ball to equalise. In the second half, Argentina had a great chance to take the lead when they were awarded a penalty. However, Iceland goalkeeper Hannes Þór Halldórsson turned out to be the country’s hero when he saved a Lionel Messi shot with a spectacular dive on the right.The game didn’t see any more goal as Iceland caused a massive upset on their World Cup debut.This was the second draw of the 2018 World Cup. Russia, Uruguay and Iran won the first three matches of the tournament before Portugal and Spain played out a 3-3 draw.