The former Southend winger has endured a frustrating time since arriving at the Liberty on a free in the summer of 2008 after failing to find the back of the net in over 50 appearances.
But the long wait was finally over when he half-volleyed an Angel Rangel cross into the back of the net, and Sousa hopes that it will be the first of many.
“It’s all been a question of confidence with Mark,” he added. “We’ve always believed in him and we’ve been working hard with him because before he came here he scored a lot of goals with Southend.
“I hope this goal will help him believe in himself a lot more, because he’s a quality player.”
The Swans boss was delighted with the team’s performance: In some parts of the game we played our best football of the season. I am so proud of them.
“It’s always nice to beat your old side. As a player I always tended to win when I came up against my former teams; now I’ve done it as a manager.
“I was told Swansea hadn’t beaten QPR in the league since 1955, so it was about time we changed that.
“It was an important win against a good quality team looking for promotion. QPR came with a lot of confidence on the back of some good results.
“It was a great show because my players understood the right moments to win the game. We kept possession well and chose the right moments to take advantage of their nine men.
“It is a great step for us and an important three points going into the international break.”
