The many of William Carvalho (42 '), Gonçalo Guedes (58 '), Cristiano Ronaldo (80') and Bernardo Silva (86 ') allow Portugal relieve your situation a little B Group, where he is now second, with five points in three games, but far from the leader of the key, Ukraine, with 13 in five games.
Although Ukraine seems far away, Portugal took an important step to get at least second place, which also gives a direct ticket to the European Championship, and drove away a direct rival like Serbia, which is now fourth with four points in as many games, tied with Luxembourg, which is third.
When Portugal had placed with a two-goal lead, Serbia was able to cut distances with a goal from Nikola Milenkovic (68 ').
After that much Serbian, he entered the game, in the 72nd minute, the new young Portuguese star, Joao Felix, signed this season by Atlético Madrid, replacing Guedes, so the Portuguese team counted for a little more than a quarter hour with the duo Cristiano Ronaldo-Joao Felix.
And precisely with both on the pitch came the goal of Cristiano Ronaldo, who received a pass to the hole of Bernardo Silva, and beat the Serbian goalkeeper in one on one.
Aleksandar Motrovic (85 ') approached Serbia on the scoreboard (3-2)before Bernardo Silva I responded a minute later with the fourth Portuguese both.
With the game almost decided, the Serbian striker of Real Madrid entered the field, Luka Jovic, in minute 87.
The worst news for Portugal and for Barcelona was the right lateral injury Nelson Semedo, which had to be removed on a stretcher in the 63rd minute, after an entry by Aleksandar Kolarov.