U.S. stock futures tumbled in early trading, following global equities lower after Apple (AAPL) became the latest company to warn about the coronavirus’s impact to its business for the current quarter. /ES-14 points. SPY -1.20. Expect SPY high 336.80. low 335.50, break it will be 335-334.80. Trades : Buy SPY 337 put after open run...