The former No. 1 overall pick had scored just two goals for the Union before bagging a brace against the Earthquakes.
After scoring just two goals in his first 18 games for the Philadelphia Union following an April trade from the Montreal Impact, Wenger bagged a brace in a 4-2 win over the San Jose Earthquakes.
"He's a special player who just needs confidence," Union coach Jim Curtin said during his postgame news conference. "And a night like tonight certainly gives a guy confidence. ... He's a guy with an incredibly high ceiling. I think you're seeing the start of something."
Wenger, who was feeling under the weather, scored the 10th-minute opener and 79th-minute insurance tally on a night that the Union (7-9-9) climbed within one point of a playoff spot.
"Today was a tough day, to be honest," Wenger said in quotes published by MLSsoccer.com. "I'm not feeling very well. I feel really sick. Half the day was just trying to keep myself going. But I did have some success going forward. And when you have success, you just have to try to build on that."