Asia-Pacific markets were set to open lower on Monday as investors looked toward a slate of regional economic data. Japan's benchmark Nikkei 225 was set to open lower, with the futures contract in Chicago at 50,365 against the index's last close of 50,376.53. Japan will release its GDP growth rate later today. Futures for Hong Kong's Hang Seng index stood at 26,500, slightly lower than its last close of 26,572.46. Australia's benchmark S&P/ASX 200 opened 0.26% lower. Markets will also be