Brazil continued their ominous run at the FIVB Volleyball World Championship with a 25-15 25-21 25-21 win over Bulgaria.
The South Americans are the only side to have mustered 12 points from a possible 12 in the second round and a record fourth title in a row looks within their grasp.
Wing spikers Locarelli and Wallca did much of the damage for Brazil - who moved to 99 wins in Championships history - respectively racking up 13 and 14 points.
Brazil coach Bernardo Rezende was delighted with his side's consistency, against a Bulgaria outfit that had racked up five points from their first three games.
He said: "The key of the victory was the experience. We saw how they played against Russia and Canada.
"We started aggressively to let them always behind. We played with some good skills, but there are still some elements need to be improved.
"Bulgaria is going to play better, volleyball is a game of different elements and we are now trying to get the best of these elements."
Behind Brazil in Pool E, Russia grabbed a fourth win from four, crushing Finland 25-10 25-18 25-16 and Germany were similarly dominant against China, securing a 25-19 25-22 25-17 success.
Canada dropped a point to their top-three rivals after requiring five sets to see off 2010 finalists Cuba 25-27 25-18 23-25 25-11 15-13.
France moved to the top of Pool F with a 21-25 25-17 29-27 25-18 win over Argentina, but three-time champions Italy look in strife after a 25-19 29-27 25-22 defeat to Serbia left them seventh in the group, requiring a steep upturn in form to even harbour hopes of a place in the next round.
Hosts Poland remain second behind France despite losing 29-27 25-22 25-27 25-23 to United States and Iran moved into contention for a top-three spot by beating Australia 25-23 25-21 21-25 25-17.