Who will come out on top in the battle of the managers Gareth Southgate or Óscar Ramírez? But if it means seeing more goals like that of Rashford's tonight, then I'm all for it.
Rashford figures to play an important role for England in Russian Federation.
"You work on them in training so, when one comes off in a game, it's the reward you get", he told ITV when asked about his stunning goal.
"He had a hard end to the season having to play on his own as a No. 9 at times".
"I just tried to play free today and enjoy myself but try and do it within a structure, so it's good practise for what we need in the tournament".
"Anything's possible so we have to go there with the highest expectations".
Only John Stones retains his starting place from the 2-1 friendly win over Nigeria at Wembley on Saturday as Gareth Southgate shuffles his pack for England's first match at Elland Road in 16 years.
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However, it was another youngster in Rashford, 20, who caught the eye from the off.
The only other time these two teams met was in the 2014 World Cup, which was a notoriously (what some would call boring) 0-0 draw.
Rashford, who impressed throughout with his speed and control, fired England ahead in the 13th minute, unleashing a dipping diagonal drive from the right which flew past helpless Costa Rica keeper Keylor Navas.
Navas kept his side in the game by denying Jamie Vardy from point-blank range as he latched onto Leicester team-mate Harry Maguire's knockdown.
Southgate held off making any changes until the hour mark and left Harry Kane in reserve for the full 90 minutes as his side continued to control the game after the break.
Substitute Danny Welbeck added a second on 76 minutes when he got his head to Dele Alli's cross and so England head to Russian Federation with a 100% record from their warm-up matches, having beaten Nigeria on Saturday.
Loftus-Cheek dragged wide from distance before goalkeeper Nick Pope came on for his debut among a swathe of England alterations.