Until Evans' spectacular run in New York, captain Leon Smith looked to have an extremely difficult decision on his hands.
With Andy Murray having insisted he will be in Umag no matter how he does at the US Open - the tie starts just four days after the men's final - only one singles spot is left for Evans and James Ward to fight over.
Murray has played only two of the last-eight ties, and it has been Ward and Evans, along with Britain's doubles specialists, who have taken Smith's side to the brink of a return to the World Group.
The most impressive result came in April when they upset former champions Russia.
Ward and Evans shared top billing, with the former producing a brilliant fighting performance to defeat Dmitry Tursunov in five sets before Evans thrashed top-100 player Evgeny Donskoy to seal Britain's comeback from 2-0 down.
They have both impressed since, with Ward winning a Challenger title last month, but it is Evans who has really stepped up.
Before qualifying in New York, the 23-year-old reached back-to-back Challenger finals, and his victory over Kei Nishikori in the first round here surely makes it impossible for Smith to leave him out of the team.
Clay probably counts against Evans, whose game is much more suited to fast, low-bouncing courts, although he did win a small title on the surface this summer.
But Ward is not exactly a specialist on clay either and the player who has shown the most aptitude on the red stuff, teenager Kyle Edmund, surely will not be thrown straight into such a big match.
After his final qualifying win, Evans certainly gave the impression that he expects to be given the nod.
"I don't see why not, but it's not my decision," he said. "Whoever plays we're all going to be there and it's going to be a good week."
The Russia match is beginning to look like it could be the pivotal moment in Evans' career.
He had considered quitting not long before, and during the tie was still unsure whether he could show the commitment to the sport he knew he needed.
Since then he has been on an upward trajectory, and he said: "It was good how it worked out.
"When you win against someone who is much higher ranked, it definitely gives you confidence. I sort of rolled on from there.
"But it's not just about seven months of the year. I need to do it for 11 months out of the year."
Many people in British tennis have waited a long time for Evans to adopt such an attitude.
His talent was obvious from an early age and, although the Lawn Tennis Association has stopped his funding on more than one occasion, including at the end of last year, it has never given up on him.
Smith has been an important figure in his life, and Evans believes the team spirit within British tennis is helping all the players.
He said: "Everyone at the LTA has shown a lot of belief in me, rightly or wrongly. So I've got them to thank as well.
"I've come away with a coach and a fitness trainer. I wouldn't be able to pay for that, so those guys paying for that helps a lot.
"British tennis a few years ago wasn't so much of a team. It feels like everyone wants everyone to win now and everyone speaks to everyone and supports."