10 things you need to know before the opening bell

Here's what you need to know before the markets open.

1. *Global markets dive as the US ratchets up tensions with China over the coronavirus*. Asian markets fell first, with Hong Kong's Hang Seng index down more than 4% at the close Monday. European stocks also plunged, with the Europe-wide Stoxx 50 down more than 3.5%.
2....