Here we are at the Week 5 PPR rankings. Now that we are nearly one-fourth of the way through the fantasy football regular season, rankings and matchups are becoming more clear than ever. For these rankings, there are significant risers and fallers across all positions.Say what?! Your fantasy football league isn't using Fantrax this season? Unthinkable! Check out all the features Fantrax has to offer, and we think you'll be singing a different tune for the coming season.Week 5 PPR Rankings: Risers &…