TOKYO: Tokyo investors will be bracing for the re-opening of volatile Chinese markets next week, after the benchmark Nikkei 225 index slumped to a seven-month low on Friday. Worries over China continue to weigh on global markets as investors speculate on whether the volatility will push back the timing of the Federal Reserve’s next rate hike. World indices have seen wild swings on growing fears about China’s economy — the world’s second biggest and a key driver of global expansion — as its leaders struggle to manage a slowdown in growth. Chinese bourses re-open on Monday after a four-day weekend and investors will be keeping a close eye on trading in mainland markets.