As equity markets in the U.S. look to cap off a stunning year full of record winning streaks, all-time highs and strong returns across multiple asset classes, investors are left wondering: What will 2018 hold?

The "single most important" trade for the market next year will lie not in the stock market, but rather in Fed funds futures, said Boris Schlossberg, managing director of foreign exchange strategy at BK Asset Management.

The strategist told CNBC on Wednesday that the apparent divergence between the Federal Reserve's expectations for interest rates' direction and the market's expectations for its tightening path will be of the utmost importance as 2018 unfolds. 

Read more in CNBC.