While U.S. traders enjoy the President’s Day holiday on Monday, they’ll be keeping a cautious eye on the reopening of markets in mainland China following a week-long Lunar New Year holiday celebrating the Year of the Monkey. Caution is required after Asia markets were hammered last week, and mainland stocks are expected to follow suit. Last week, Hong Kong’s Hang Seng Index HSI, -1.22% , which was open Thursday and Friday, fell 5%, and Japan’s Nikkei NIK, -4.84% tumbled 11%. Additionally, the Hang Seng China Enterprises Index HSCEI, -1.99% which tracks mainland China stocks trading in Hong Kong, dropped 6.8% over the ... (full story)