Hammarby chased safe ground in the table when Västerås was visiting.
But instead, it would be two points for the guests who consolidate their position in the top six.
Västerås took the lead with half an hour played by Robin Andersson.
But after that, it took until barely a quarter of an hour remained before the next goal came in the match.
That time from Jesper Jonsson's club, who after six seasons in Hammarby switched to Västerås before this season.
Even a current Hammarby player would score. With ten minutes left, David Jansson reduced to 1-2. But they never came closer than that, but Västerås got all the points from the green and white meeting.