The Netherlands fought back from two goals down to draw 2-2 with Greece, while Wales ended their six-match winless run by beating 10-man Norway 2-1 in Cardiff.
Germany 2-0 Serbia: Klopp gets off the mark
Jurgen Klopp secured his first victory as Germany manager as Tom Bischof and Florian Wirtz struck in a controlled 2-0 win over Serbia at the Allianz Arena.
Germany had to wait until just before half-time to break the deadlock despite dominating the opening period. Wirtz showed excellent footwork inside the penalty area before his effort struck the post, with Bischof reacting quickest to fire the rebound into the roof of the net.
The hosts continued to create chances after the restart. Derry Scherhant went close several times on his international debut, while Nick Woltemade somehow lifted a close-range effort over the bar.
Germany finally added a second in the 60th minute. Maximilian Mittelstadt advanced down the left before finding Wirtz, who turned brilliantly away from Srdjan Babic and calmly placed his finish into the bottom corner.
Serbia struggled to create any sustained attacking threat and Germany comfortably saw out the game.
The result gives Klopp his first victory after his opening matches in charge, while Serbia have now suffered six defeats in seven matches during 2026.
Denmark 2-4 Portugal: Ramos leads Ronaldo-less attack
Portugal continued their perfect start to Nations League Group A4 with an entertaining 4-2 win over Denmark in Copenhagen despite Cristiano Ronaldo being left out of the squad.
Goncalo Ramos was the standout player, scoring twice as Portugal twice recovered the lead before pulling away in the second half.
Ramos had already struck the post before Joao Cancelo opened the scoring in the 15th minute. The full-back burst through the Denmark defence after combining with Ramos before calmly finishing past Mads Hermansen.
Denmark responded eight minutes later when Mikkel Damsgaard curled a superb effort into the far corner following Joakim Maehle's cut-back.
Portugal immediately regained their advantage. Bruno Fernandes picked out Ramos, who produced a composed low finish for his second international goal in four days.
Denmark levelled again eight minutes into the second half. Damsgaard released Rasmus Hojlund, who lifted the ball over Diogo Costa before celebrating with Ronaldo's trademark celebration.
Portugal eventually took control. Vitinha headed home Fernandes' delivery in the 67th minute before Joao Felix completed the scoring by sweeping home from Diogo Dalot's pass.
The victory gives Jorge Jesus' side three wins from three in Group A4.
Greece 2-2 Netherlands: Reijnders rescues Dutch
The Netherlands produced a strong second-half comeback to earn a 2-2 draw against Greece in Thessaloniki.
Greece looked set for another major Nations League victory after Fotis Ioannidis opened the scoring in the 23rd minute. The forward reacted quickly to Georgios Masouras' flick-on before driving into the area and finishing accurately past Bart Verbruggen.
The home side then doubled their advantage just before half-time when Ioannidis turned provider, allowing Masouras to slide the ball into the net.
The Netherlands responded strongly after the break and Virgil van Dijk pulled one back shortly before the hour mark, heading home from Joey Veerman's corner.
Denzel Dumfries twice appeared to equalise, but both efforts were ruled out following VAR reviews.
Greece could not hold on, however, as Tijjani Reijnders finally completed the comeback late in the game. Noa Lang's ball into the area was not dealt with by the Greek defence and Reijnders reacted with a powerful volley to make it 2-2.
The Netherlands had been transformed after half-time and deserved their share of the points after dominating the second period.
Wales 2-1 Norway: Dragons fight back after Haaland scare
Wales ended their six-match winless run with a 2-1 comeback victory over 10-man Norway in Cardiff, securing their first win in the top tier of the Nations League.
Norway made the better start and took the lead when Oscar Bobb raced between two defenders onto Martin Odegaard's perfectly weighted pass before finishing into the bottom corner.
Wales struggled to break down the Norwegian defence for much of the opening half, but Daniel James brought them level before the interval.
Sorba Thomas delivered an excellent ball into the area and James reacted quickly to score his 11th international goal.
Wales were handed a major advantage just seconds after the restart when Torbjorn Heggem was sent off for bringing down James after initially trying to shepherd the ball back to his goalkeeper.
Neco Williams then completed the turnaround from the resulting free-kick, curling his effort beyond the wall and into the bottom corner.
Norway pushed forward in search of an equaliser, with Erling Haaland heading wide and Jorgen Strand Larsen coming close late on.
Wales survived the late pressure to secure a crucial victory for Craig Bellamy, while Norway suffered consecutive defeats for the first time in four years.