The World Cup enters the knockout rounds on Saturday, having seen a thrilling group stage that some have hailed as the best ever. RT Sport looks back at the most-discussed moments so far, both on and off the pitch.

ROBBIE WILLIAMS’ MIDDLE-FINGER SALUTE (CLICK FOR MORE)

The tournament kicked off with controversy from British pop star Robbie Williams at the opening ceremony at Luzhniki Stadium in Moscow. who anticipated the beginning of the global football tournament.

in front of 80,000 spectators, the pop icon unexpectedly popped up his middle finger to a camera operating on the field, sparking an avalanche of comments on social media with many questioning whom the gesture was addressed at. The 44-year-old later (jokingly) explained on ITV’s ‘This Morning Show’ that he was merely giving the signal that there was one minute to go until kick-off.

NEYMAR’S ‘PASTA BOWL’ HAIRCUT (CLICK FOR MORE)

Brazil star Neymar was subjected to jeers from fans who compared his new World Cup trim with a bowl of pasta. Some joked that the new hairstyle resembled a pot noodle, while others insisted that the player looked more like a cartoon ghostbuster. The caustic remarks didn’t go unnoticed by the world’s most expensive player, as the PSG man cropped his mop for the next match against Costa Rica, which Brazil won 2-0.

SWISS PLAYERS’ ‘POLITICAL’ CELEBRATIONS (CLICK FOR MORE)

Switzerland’s World Cup win over Serbia in Kaliningrad was overshadowed by celebrations made by the two goalscorers, Granit Xhaka and Xherdan Shaqiri, both of whom are of Kosovan-Albanian origin. Both players made a winged salute when celebrating their goals in the 2-1 win, symbolizing the eagle on the Albanian flag. Shaqiri’s boots were also decorated with the flags of Switzerland and Kosovo – the breakaway region that is not recognized as independent by dozens of countries, including Serbia and Russia. The Serbian football association demanded punishment for the two players, although FIFA opted against a ban, instead fining the pair CHF 10,000 (US$10,000).

MARADONA’S STADIUM ANTICS (CLICK FOR MORE)

Argentina football icon Diego Maradona displayed a rollercoaster range of emotions during his team’s final group stage game against Nigeria, varying from a disappointing grimace on his face up to crazy celebrations involving a double middle-finger salute to the crowd when Nigeria clinched a late 2-1 win to book their spot in the last 16. He later revealed he had needed medical treatment during the game, but the 57-year-old had already caused a Twitter storm of memes when an image of him crossing his chest during goal celebrations went viral. Memes depicting Maradona flooded the internet with the scandal-prone football icon being placed in humorous well-known scenes, from Titanic to Queen's Bohemian Rhapsody video, to wrestler The Undertaker's entrance.

GERMANY’S EARLY EXIT (CLICK FOR MORE)

One of the tournament’s biggest shocks so far came from the reigning world champions – Germany – who were sensationally eliminated at the group stage. Die Mannschaft got off to the worst possible start in Russia, losing their World Cup opener to Mexico 1-0. Germany’s second group stage against Sweden was a nail-biting thriller, with the defending champions avoiding a draw by scoring a last-minute goal to revive their chances of going through.

However, their reprieve proved short-lived as they suffered defeat to South Korea, who sensationally beat Germany 2-0 in their final group game, sending the Germans packing at the first hurdle for the first time since 1938.  

READ MORE: World Cup last 16 line-up complete as Group G concludes final round of games