Hey, RotoBallers! Week 15 is here! If you are reading this, most likely, you made the fantasy playoffs. It's time to set those winning lineups with our Week 15 fantasy football FLEX rankings.With it being the first week of the fantasy postseason, selecting the correct FLEX could be the difference between advancing or being bounced from the fantasy playoffs. Fantasy managers will have to wait an hour before the 8:15 PM ET kickoff to determine if Las Vegas Raiders running back Josh Jacobs (quad) ...