16 of the biggest International teams from Europe battle it out to see which rules supreme.
These are the two matches today from Group A:
Poland vs Greece: LIVE from 17:00pm on BBC1
The co-hosts are in action against the 2004 winners Greece in their first match. Can they take all three points in-front of their home fans?
Russia vs Czech Republic: LIVE from 19:45pm on ITV1
This could be a tough match for both sides with Russia's attack lethal however, the Czech's have one of the best goalkeeper's in the world with Petr Cech and Arsenal midfielder Tomas Rosicky to deal with.
Poland 1 Greece 1
What a way to start Euro 2012! An under-rated match in truth started off well after the opening ceremony celebrations.
|Beautiful sight: Hosts Poland and Ukraine join together to create a great opening ceremony to Euro 2012.|
Poland dominated throughout the first half, with Borussia Dortmund striker Robert Lewandowski scoring a header in the 17th minute from a deadly cross to give the hosts the lead.
|Special one: Borussia Dortmund striker Robert Lewandowski scores the opening goal of Euro 2012 for Poland.|
The crowd erupted in and out of the stadium after the goal.
Just before half-time, Greece defender Sokratis Papastathopoulous was sent off after his second bookable offence after pulling down a Polish player who was alone and close to scoring.
|Oh dear: Defender Papastathopoulous is given a controversial second yellow card before half-time.|
Greece were then down to ten men and had to fight to get back into the match.
After half-time, the Greece manager Fernando Santos introduced PAOK striker Dimitris Salpingidis who made an instant impact, by scoring in the 51st minute from a tap-in after goalkeeper Wojciech Szczesny's mistake.
|Super sub: Salpingidis scores a tap-in in the 51st minute to give Greece a chance of winning the match.|
In the 68th minute, Arsenal goalkeeper Szczesny gave away a penalty after tackling Salingidis inside the box, and not getting the ball.
He was given a straight red card, but captain Giorgos Karagounis's penalty was saved by PSV goalkeeper Przemyslaw Tyton.
|Bye bye: Arsenal goalkeeper Wojciech Szczesny is sent off for a challenge on Salpingidis inside the box.|
|Penatly of doom: Greece failed to captalize on their penalty chance, with Tyton saving the day for Poland.|
Greece had a goal disallowed in the 75th minute, and despite their efforts to try and score again, the match finished 1-1.
Ultimately, the two sides had to settle for a draw in game which offered plenty of excitement from start to finish.
Russia 4 Czech Republic 1
The second and final match on the opening day of Euro 2012.
Midfielder Alan Dzagoev broke the deadlock for Russia in the 15th minute after a rebounded header which hit the post came back to him, when he fiercely hit the ball past Cech.
|You are being watched: Young startlet Alan Dzagoev scores for Russia in the 15th minute, amid reports of a move to the EPL soon.|
Arsenal winger Andrei Arshavin cut past the Czech defence before finding Roman Shirokov who doubled Russia's lead in the 24th minute.
|Goal time: Roman Shirokov celebrates his goal for Russia in the 24th minute to double the lead.|
Czech player Pilar scored in the 52nd minute in the second half after Russia failed to apply the offside trap and he went round the goalkeeper before tapping the ball into an empty net to give the Czech's hope.
|There's still hope: Pilar goes round the keeper before scoring for Czech Republic in the 52nd minute.|
Midfielder Dzagoev took a touch of the ball, before hitting a bullet strike in the 79th minute to give the Russians a 3-1 lead.
3 minutes later, Tottenham striker Roman Pavlychenko cut inside the defence before smacking the ball past Chelsea goalkeeper Petr Cech, giving him no chance.
|No stopping that: Tottenham striker Roman Pavlychenko scores against Chelsea goalkeeper Petr Cech to give Russia a 4-1 lead.|
|Winning feeling: Russia celebrate winning the first three points of the Euros against Czech Republic.|
Group A Table:
1. Russia - 3 points, 4 goals
2. Greece - 1 point, 1 goal
3. Poland - 1 point, 1 goal
4. Czech Republic - 0 points, 1 goal
Manchester United are ready to make Borussia Dortmund and Poland striker Robert Lewandowski - who scored today, their second summer signing for £15million.
Bayern Munich are ready to make a £20million bid to take Manchester City striker Edin Dzeko back to Germany.
Chelsea are looking to offer Roberto Di Matteo a one-year contract to prove himself as the permanent Chelsea manager.
Stoke are interested in signing former Manchester United striker Michael Owen who has been released.
Join me tomorrow for Group B action:
Holland vs Denmark: LIVE from 17:00pm on BBC1 at Metalist Stadium
Germany vs Portugal: LIVE from 19:45pm on BBC1 at Arena Lyiv