Hosts Russia take on Saudi Arabia in Group A
Also in Group A: Egypt v Uruguay - Friday, 13:00 BST
Other Friday matches: Group B - Morocco v Iran (16:00 BST, BBC TV & 5 live), Portugal v Spain (19:00 BST, 5 live)
Russia
Two-goal scorer Denis Cheryshev says (via a translator): "There are no words to express what I'm feeling right now. I'm so happy for my family who have struggled with my injuries - they deserve this.
"I could never have dreamed of anything like this."
Russia 5-0 Saudi Arabia
Russia scored more than twice the amount of goals in this game than they did in the entire 2014 World Cup finals over three games (two).
I've seen a few tweets point out that it was Ramadan and Saudi Arabia players were fasting.
I've found some articles, but nothing definitive, to suggest they have broken their fast intermittently in the build-up to the tournament.
That game is the biggest margin of victory in an outright World Cup opener ever.
That's not including the years (1930, 1934, 1954, 1962) that several games kicked off at the same time to start the tournament.
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Denis Cheryshev is the first sub to score twice in a World Cup game since Andre Schurrle against Brazil (7-1) in 2014.
That sounds more impressive until you realise that was only three games ago.
There was so much late action, that in case you missed any of it, here's the breakdown.
Denis Cheryshev - two goals
Aleksandr Golovin - one goal and two assists
Artem Dzyuba - one goal and one assist
Yuri Gazinskiy - one goal
Roman Zobnin - one assist
BBC Reality Check have done a piece asking whether you should enter your work sweepstakes.
Anyone who got Saudi Arabia will have strong opinions on that right now.
Image source, .#bbcworldcup or text 81111
John: Worst team at a finals since El Salvador in the 80s..Why don’t teams ever play that bad against England?
VB: If Uruguay make an effort they could well get 40 goals against this Saudi team
Thomas: The Saudis looked intimidated, unambitious, lacked ideas and a star player to finish moves
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Russia 5-0 Saudi Arabia
Anyone with a maverick Denis Cheryshev bet for the Golden Boot will probably be feeling a bit happy right now.
FT: Russia 5-0 Saudi Arabia
Alan Shearer
Former Newcastle striker on BBC Radio 5 live
It has been a really positive night for Russia who have done what they had to do, but I don't think the big boys will be too worried by that performance. Saudi Arabia were hopeless and they didn't have one effort on target.
That is the biggest victory by a host nation in the opening game of a World Cup since 1934 when Italy smashed the United States 7-1.
We'll bring you the other goals soon.
World Cup 2018: Russia's Yuri Gazinskiy scores first goal of the tournament
Substitute Cheryshev scores Russia's second goal
Ready to watch a couple of the goals?
Russia 5-0 Saudi Arabia
Dion Dublin
Ex-Aston Villa striker on BBC Radio 5 live
We can see the Russians fans now. The flags are waving and they are singing in the stands.
Russia 5-0 Saudi Arabia
I don't even know what to make of that. 5-0 in the opening game of a World Cup.
But did Russia even play that well? It's hard to know. Saudi Arabia were terrible.
Russia 5-0 Saudi Arabia
Image source, .Who caught your eye in the game and who was rubbish?
Have a go at our player ratings here - and see how everyone else has rated the players too