Fink’s goal was his team-leading third of the season.

Rivas, who grew up in Las Vegas, made a strong run in the box and took a nifty pass from Bahner to knot the score.

The tally appeared to switch the momentum, but Williams exploded for two goals 12 minutes later.

STLFC coach Anthony Pulis was pleased with the offensive effort, calling it one of the best of the season. Yet he was frustrated by the lack of marking on the set piece tallies.

“We shot ourselves in the foot,” Pulis said. “The manner that we conceded the three goals was extremely disappointing.”

Williams tallied in the 75th minute off a blast from the right wing to break a 1-1 tie. He then converted off a free kick to provide a two-goal cushion.

Birmingham defender Mathieu Laurent gave his team the early lead by drilling in a header off a free kick from Kyle Culbertson in the 38th minute.

The second half was played in a steady rain.

STLFC is still in a good position after just six matches. The lightning-quick start to the campaign had ramped up the expectations.