Defending champions China bounced back from their opening day defeat at the International Volleyball Federation Women's Under-20 World Championship but needed five sets to beat Poland in Mexico.
The 2017 winners, beaten by Peru on day one yesterday, saw off the Poles 23-25, 25-17, 25-12, 25-27, 15-5 at Domo de la Feria in León.
It means their Pool B account is up-and-running but it is Peru who top the pile after they collected a second victory.
The South Americans whitewashed Egypt 25-16, 25-15, 25-16 after their five-set triumph over the Chinese to begin the tournament.
Poland had beaten the Egyptians 3-0 on day one with the African side still awaiting their first set.
In Pool A there was also a reversal of fortunes for the United States who defeated hosts Mexico in straight sets at Hermanos Carreon Auditorium in Aguascalientes.
The Americans were beaten in four by Italy on day one while Mexico begun on home soil with a 3-1 win of their own over Cuba.
This time it was the US who prevailed, 25-17, 25-23, 25-21.
Italy, the 2011 winners, registered a second win as they beat the Cubans 25-20, 25-13, 25-17.
In Pool D in León, Japan maintained their impressive form by beating six-time champions Brazil in straight sets.
They came through 26-24, 25-22, 25-19 and have yet to drop a set following their opening day thrashing of Rwanda.
Dominican Republic, who won the tournament in 2015, recovered from their 3-0 opening loss to Brazil by getting past the Rwandans 25-19, 25-15, 25-14.
Pool C in Aguascalientes saw a second win from two for Russia who beat Turkey in five, 25-12, 25-17, 16-25, 20-25, 16-14.
Russia, the runners-up at the last edition, had begun with a victory in four over Serbia.
The Serbians recovered from that defeat by coming from two sets down to beat Argentina 13-25, 19-25, 25-22, 25-12, 15-13.
It means Argentina have now lost two matches in five sets after going down 3-2 to Turkey on day one.
Pool play will conclude in Mexico tomorrow.
The top two teams from each will be split into two further pools of four – Pools E and F.
The top two sides from Pools E and F will then qualify for the semi-finals and finals.