Even with top scorers Artur Szalpuk and Bartosz Kwolek on the bench for most of the match, Poland snapped its three-match losing skid with a sweep of Argentina. Wallace DeSouza scored a match-high 16 points and had help from Lucas Loh and Lucas Saatkamp in leading Brazil to a sweep of Australia, ending a three-match skid.
Colombia locked up Pool A while Puerto Rico clinched a semifinals bid in a sweep over Australia.
Czech Republic blocked their way to the Pool B win and Estonia improved to 1-1 on day two.
Australia is the only team of the three coming into the week on a victory, having found its stride, going 3-0 in South Korea, while the rest of the Pool 17 teams are looking to snap three-match losing streaks.
An adjustment to the rule will have the winners of the Challenger Cup go directly to the 2019 Volleyball Nations League.
Colombia blocked host-nation Peru into submission as they and Bulgaria earned opening day sweeps.
Portugal gave the home crowd plenty to cheer about as they along with Czech Republic earned opening day sweeps.
After 120 matches, 15 per team and several standout performances in women’s VNL play, there was no question about who was the standout performer of the preliminary round: Poland’s Malwina Smarzek