Real Madrid goalkeeper Navas was completely caught out moments later, though, as Rashford unleashed a powerful drive from 25 yards that dipped perfectly over him and into the top corner for his third worldwide goal.
Marcus Rashford and Danny Welbeck scored England's goals, on what was a memorable night for Pope.
Harry Kane , Raheem Sterling and Dele Ali are among 15 substitutes for England that include Tom Heaton, Jake Livermore and Adam Lallana, the three players on the standby list for Russian Federation.
This is what England need, sending the team up and down the country, playing their home games in front of all members of their fanbase - not just those who live in London and tourists visiting - to bring excitement back into the national game.
"I'm really pleased to have him with us".
Aside from Rashford, other players who impressed the Elland Road crowd were Danny Rose, who was aggressive going forward, and 22-year-old Ruben Loftus-Cheek, who showed composure beyond his years, even if Southgate believes he is still too inexperienced at this level.
However, Real Madrid's Champions League-winning goalkeeper could only watch in wonderment in the 13th minute as the ball flew in.
Jamie Vardy was denied by a flying Navas from point-blank range as England pressed their advantage, although Jack Butland made a good save to deny Johan Venegas after a rare Costa Rica break.
We hear from the England manager as well as Jordan Henderson and Trent Alexander-Arnold who reflects on his debut.
"The 23 are all ready to play, that is the most important thing".
Rashford endured a hard end to the season at United, scoring just four times in 2018 at club level, and suffering some stinging criticism from Jose Mourinho.