With the game tied 1-1, Jaqua struck home from five yards after receiving a low cross from Roland Kirchler to give Altach, 8th place in the 10-team league, a 2-1 win over Rapid Vienna, which entered the game in third place.
A week ago, in his debut, Jaqua scored the tying goal for Altbach against Austria Vienna.
After his second goal, one Austrian newspaper described the 6-foot-3 striker as a "penalty-area cobra with a lion's heart." Jaqua was also praised for his defensive work.
Jaqua played college ball at the University of Portland in 2000-02. He entered MLS through Project-40 and was drafted in 2003 by the Chicago Fire, for which he scored 21 goals in 91 games during four seasons. He spent 2007 with the Los Angeles Galaxy and the Houston Dynamo. He scored six regular-season goals and one playoff goal to help Houston win the 2007 MLS title.
"I was always confident we could win, even in the second half," said Jaqua on Altbach's Web site. "I'm very happy about the goal. The atmosphere was sensational."
An Altbach home crowd of 8,000 attended the game.