Trent Alexander-Arnold started for just the second time in a competitive global and the Liverpool right-back showed why he may overtake Kyle Walker in Southgate's pecking order with a series of the inviting deliveries that have become his trademark at club level.
Portugal went on to win the Nations League match 3-1, making it to the final of the inaugural UEFA competition, but it had to overcome the decision that didn't go in its favor.
Good evening! Welcome to the Live Updates for the Nations League final between Portugal and the Netherlands.
But Portugal, the European champions, were not to be denied, as Ronaldo struck in the 88th minute to restore the lead and then sealed victory in stoppage time.
When the game seemed headed to extra time, Ronaldo came through to put the hosts ahead again.
The Swiss enjoyed the better of the game in Porto, but the five-time world player of the year was lethal in scoring his 53rd career hat-trick with three exquisite finishes.
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The pair were level at one set apiece, with Thiem leading 3-1 in the third when the players left the court. There was another rain delay midway through the fifth set after it resumed on Saturday.
The Portugal captain is however no longer his country's only star name, with Bernardo Silva starring for Manchester City where he could soon be joined by Joao Felix.
But when their deserved equaliser arrived it came in weird fashion, with Silva going down and appearing to win a penalty for Portugal before VAR intervened.
Ronaldo, whose side face the Netherlands in Sunday's Nations League final, is now only 12 short of his 100th worldwide goal and could conceivably reach 200 global caps, having amassed 157 appearances in his 16-year worldwide career.
"I've never seen anything like that", Switzerland coach Vladimir Petkovic said.
"It's all about routine I would say, if you watch the top penalty takers, if you watch Harry Kane, he has got his own routine so you've got to create your own routine to make sure everything is done to perfection".
Swiss midfielder Steven Zuber went down under a challenge from Nelson Semedo as he ran onto Xherdan Shaqiri's through ball and appealed for a penalty kick, but play still continued.
"The English supporters turned against the police who arrested two of them and identified a third".