The United States, who have won a record 32 Davis Cup titles, join Canada and Argentina in Malaga after qualifying with a resounding 8-1 performance.
The Americans topped Group C ahead of Germany, who won their other ties against Chile and Slovakia.
Defending champions Italy qualified before their final Group A tie against the Netherlands despite missing world number one Jannik Sinner following his US Open triumph earlier this month.
The Dutch side need to beat the Italians on Sunday to guarantee a second-place finish and reach the knockout stages.
Spain and Australia had both sealed their Final Eight places before facing each other on Sunday, but it was Spain who triumphed 2-1 to top Group B.
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The GB Davis Cup team may have a new look to it next year if Evans does decide to bow out.
And the competition will also look a little different, with September’s 16 team group stage reverting to eight knockout ties.
So there will not be six days of tennis in Manchester next September, but GB could still return if awarded a home draw.
The details are yet to be released but teams not offered a wildcard will need to win ties in early February and mid-September to reach the eight-team Finals, which are not sure to stay in Malaga after this year.
The changes will be popular with many players – and will largely avoid two countries battling it out in a neutral venue with little in the way of atmosphere.
