Ghana winger Christian Atsu scored on his return from the Africa Cup of Nations on Friday, helping Porto to defeat Beira Mar 2-0 in the Portuguese top-flight.The youngster, who was one of Ghana’s players at the recent Africa Cup of Nations, showed that he has learnt from the AFCON with the exquisite finish.Portugal’s Primeira Liga 19th round clash saw two goals from Atsu and Jackson Martinez help Porto earn the away victory in Aveiro city.In the 34th minute, Porto broke the deadlock as Joao Moutinho’s pass found Atsu outside the box.The Ghanaian youngster arrowed in from 25 yards in his first game back from national duty at the African Cup of Nations.Beira Mar escaped the punishment over a handball in the box in the 42nd minute.In the 72nd minute Martinez got the ball in the left side of the penalty area and took a skilled move with his left foot to break loose from the defender before making a delightful finish over the goalkeeper.In the 81st minute, Joao Moutinho was replaced by Andre Castro, as the Dragon has to save some energy for an important midweek Champions League clash against Malaga.Porto continues to lead in the Primeira Liga after the victory.