Russia’s undefeated record was never in doubt as the FIVB World Cup front-runners mauled Argentina in straight sets (25-10, 25-10, 25-16) on Wednesday.
Seventh-ranked Russia rested superstar Tatiana Kosheleva but still had far too much firepower for their opponents who fell to a 1-3 record and eighth spot on the standings.
Alexandra Pasynkova (14 points) and Nataliya Obmochaeva (13) filled the void left by Kosheleva to improve to a perfect 4-4 for the championship.
Hosts Japan overpowered winless Kenya 3-0 (25-15, 25-20, 25-12) to hold onto second place on 10 points with a 3-1 record.
USA banked back-to-back wins with a 3-0 (25-18, 25-15, 25-12) thrashing of Peru to join Japan on 10 points with three wins from their first four matches.
Coach Karch Kiraly rested several starters, leaving Tori Dixon (14 points) and Nicole Fawcett (12) to lead the number-one ranked Americans to a comfortable victory.
China sneaked home in four tight sets (23-25, 25-15, 25-20, 25-23) against Korea to sit in fourth spot on nine points.
Kim Yeon-Koung piled on 27 points in a losing cause as Korea dropped to a 2-2 record.
The Dominican Republic also had to work for their third win of the championship, edging out rivals Cuba 3-1 (25-22, 25-22, 18-25, 25-23).
With their third-straight win Dominican Republic sit in fifth on equal points with China.
Serbia round out the top six after cruising to an easy 3-0 (25-7, 25-11, 25-3) win over Algeria.
There are six matches scheduled for Thursday to complete the first round of competition.