If you are serious about winning your fantasy league football championship, stay on top of your fantasy football team throughout the year.

Each week during the NFL fantasy football season, KFFL brings you its Fantasy Football Waiver Wire, which breaks down players to pick up. Be aggressive when picking up fantasy football free agents. Even if you do not need a player, you can tuck him away for depth or block others from adding him to their fantasy football team.

Note: Percentage of polled leagues in which player is available in parentheses

Fantasy football free agents: Look to acquire

The following players will have greater significance in deep fantasy football leagues. In shallow fantasy football leagues, they are not as high of a priority but should be considered based on your fantasy football team's needs.

Dennis Pitta, Baltimore Ravens (50 percent)

Ascending in the passing game

Pitta has alternated solid performances with bad ones the past five games, averaging 5.33 receptions, 51.67 yards and a touchdown per game in three even-numbered weeks and accounting for just two grabs and 24 yards in Weeks 11 and 13. If the trend continues he's due for a stinker next Sunday. Still, you can discount three scores in five games based on what is likely nothing more than coincidence.

NEW - Tony Scheffler, Detroit Lions (96 percent)

Injuries have decimated Matthew Stafford's weapons in the passing game; the latest to fall being Brandon Pettigrew (ankle). Their loss is Scheffler's (theoretical) gain - the veteran has been targeted a whopping 31 times in the past four games, which has resulted in a less impressive 13 grabs, 154 yards and a touchdown. Still, as we often note, opportunity is the path to fantasy relevance. That alone gives Scheffler some appeal.

Fantasy football free agents: One-week plays

The following fantasy football pickups are for those who need injury or bye week replacements. They are not players you immediately acquire - unless your team is in dire straits. Some have, however, shown some life and should be followed in case they materialize as options beyond their temporary use.

NEW - Coby Fleener, Indianapolis Colts (84 percent)

With two catches, 35 yards and a touchdown in two games since returning from injury, Fleener isn't exactly setting the fantasy world ablaze. That could change this Sunday when the Colts face the Houston Texans, who have given up seven receptions for 70 yards and a score per game since Week 11. Sure, it's something of a gamble, but for a widely available player Fleener isn't a bad option to roll the dice on.