Hernandez told the club's official website: "It was very, very important for us to win because we started the season with two losses.
"The last two weeks have been very, very hard. When you play in Europe you have a lot of games to play and of course we had to play Manchester United and Tottenham in our first two league games.
"But today we worked hard as a team and we deserved to win the game. I was also delighted with my goal – it was a great pass from Michu."
Swansea have taken three points from their first three Premier League games this season.