Euro 2016: 5 things we learned from Matchday 1

#3 Take your chances when you're dominant, else...

Yes, it's an old adage, and there's nothing new about it in football, but made all the more relevant because the team's at this year's edition aren't too far apart. Despite being a few elite teams present in the competition, the overall pool is very good and any team has a chance of pegging back some of their more fancied opponents.

England, Portugal and Republic of Ireland all found out what happens when you don't kill the game off, while Spain and Switzerland were almost made to pay for their wastefulness too.