"We were supreme underdogs against that lineup," Figueroa said. "It was motivation to show them what kind of pitcher I was."
On Thursday, demonstrative Dominicans dominated the All-Star-laden U.S. squad. The Americans endured a scoreless streak of 14 innings spanning the two defeats, and Figueroa limited them to two singles in six shutout innings.
The Americans have still not won the WBC or even reached the final in three tries.
"When you play double-elimination, it's a crapshoot," manager Joe Torre said. "And Figueroa pitched his tail off tonight."
J.C. Romero escaped a bases-loaded jam in the eighth and retired the final four batters for his first save. The last out triggered a pileup of Puerto Ricans behind the mound.
They advanced for the first time to the semifinals, which begin Sunday in San Francisco. They'll play the Dominican Republic on Saturday in the final game in Miami, which will determine seedings for the championship round.
Two-time defending champion Japan and the Netherlands round out the final four.
Figueroa (2-0) has a modest 20-35 record for six teams in nine major-league seasons, with his most recent big-league game in May 2011. He pitched in Triple-A last year but dominated the best of the U.S.
World Baseball Classic
O Dominican Republic vs. Puerto Rico
Saturday, 11 a.m.
TV • MLB Network