An opponent's opponent rank indicates how well a player's next NFL opponent plays at that position. Low numbers indicate a difficult opponent; high numbers indicate an easier opponent. The Start Percentage displays the number of fantasy leagues in which a player has begun divided by the number of leagues in which he is eligible. This number can be used as a measure of consensus opinion on whether it makes sense to start him or not. Players are ranked within their positions. For example, if there are 10 quarterbacks in the league, then each quarterback would have a number from 1 to 10. These numbers would be based on who people think will have the best season from this group. There are several ways to determine who your opponents will be in any given week. You can use ESPN's FPI (Football Power Index), which estimates the strength of every team in football using multiple factors including game script, coaching change, injury report, etc. ; Automated Fantasy Sports (AFS) picks up where ESPN leaves off and uses computer algorithms to generate its weekly top 250 players list; or you can just guess and see what happens. If you want to get fancy, there are statistical methods for determining expected win/loss records too.