Hammarby took the lead already after ten minutes when he met a cross neatly and placed 1-0.
The goal was his tenth this season.
Already ten minutes later, Joel Nilsson added, then played by Besara.
Just before the break, Darijan Bojanic made it 3-0 with a neat shot from outside the penalty area.
He made his way into the court with the ball, feinted a Varbergs player and fired the shot.
If Hammarby wins, they move up to third place in the Allsvenskan table.
Five games remain in the season.
The match is in progress.