US President Barack Obama made a push for free trade across Asia and the Pacific, at a regional summit clouded by tensions between its biggest economies.
The presidents of the United States, China and Russia were due to meet with other Pacific Rim leaders for a summit in Japan that threatens to be overshadowed by regional tensions.
The 16th Asian Games opened in central Guangzhou on Friday in a blaze of pyrotechnics as China staged the biggest sporting gala since the 2008 Beijing Olympics.
G20 leaders vowed to avoid currency manipulation, but differences between China and the US prevented major progress in rebalancing the skewed global economy.
G20 leaders vowed to avoid tit-for-tat currency devaluations, but China's strong objections to any brakes on its export machine undermined a US push to redress skewed global trade.
G20 leaders began a second day of talks on resolving bitter trade and currency disputes with the host South Korea saying it expected some sort of agreement to be reached.
US aerospace giant Boeing halted test flights on its new 787 Dreamliner, dealing a fresh setback to a program already running about three years behind schedule.