The baseball world will descend on National Harbor, Maryland for this week's Winter Meetings, with executives and agents looking to improve their clubs via free agency and/or trades.Twenty free agents from a class of 191 had signed as of Friday night, but even with Yoenis Cespedes, Edinson Volquez, Neil Walker and Josh Reddick off the board, there are plenty of notable names left, including a trio of elite closers.