You may recall these teams met in the group stage of the 2014 World Cup, when the game went according to form: Costa Rica's remarkable defense held England off the score sheet, closed out a scoreless draw, and took Los Ticos to the knockout rounds a a group winner. England went home early.
In this tournament, England is the form team: winner of Group A and the only team to beat France in UEFA qualifying for this competition. Costa Rica barely managed to qualify for this World Cup despite being the home team for the 2017 CONCACAF U-20 Championship. And it is in the knockout rounds mostly because its 'keeper, Erick Pineda, has played very well for three consecutive games.
So England is almost the prohibitive favorite to win this game. Of course, England is often the favorite to win games at World Cups of many varieties, and England often fails to match that expectation.
Costa Rica doesn't seem to be in anything like the necessary form to knock this young England team out of its stride, but it has got this far into this tournament without showing great form - maybe it can take another unlikely step forward.
Per livesoccertv.com, here's where to find the game if watching from the USA: