It's the conclusion of week 1 of the Fantasy football season, and we can now draw a few conclusions from the first games of the year. Injuries have left some fantasy teams with a lack of depth already, while other teams have been happy to watch sleepers like Kareem Hunt turn in huge fantasy performances. In any case, fantasy owners always need to keep an eye on the Waiver Wire, so here are the five key waiver wire additions that need to be made in week 2.

1. RB Kerywnn Williams (Arizona Cardinals)

Now that David Johnson is set to miss significant time with a wrist injury, Williams becomes by far the most valuable player on the waiver wire.

Johnson scored the highest number of fantasy points among all fantasy running backs last year, and if Williams gets even a portion of those numbers, he will offer huge value to whoever has the fortune to grab him off the waiver wire.

2. WR Cooper Kupp (Los Angeles Rams)

The hype in the preseason surrounding Kupp translated into real production, as the rookie wide receiver had 4 receptions for 76 yards and a touchdown in week 1. Those were the highest receiving totals on the Rams, and he's earned a spot on fantasy rosters after a strong debut.

3. TE Charles Clay (Buffalo Bills)

I've been all over Charles Clay as a sleeper tight end in many of my articles. Clay rewarded my faith in week 1, with four receptions for 53 yards and a touchdown.

It doesn't show up in the stats, but Clay should have caught another touchdown in the first half. Without Watkins and Woods, Clay has suddenly become a decent fantasy player who has scored double digit fantasy points in four of his last five starts.

4. Raiders D/ST

This isn't based on how the Raiders played on Sunday, but it is a testament to just how bad the Jets offense is going to be this season.

The Jets looked terrible against the Buffalo Bills, as McCown threw two interceptions and had several stalled drives. If the Raiders unit is available in your leagues, they are the defense to start in week 2.

5. RB Tarik Cohen (Chicago Bears)

Thought Jordan Howard had a stranglehold on the starting running back job? Think again.

Cohen played in 43% of the snaps and managed to rush for 66 yards on just five carries while adding another 47 yards and a touchdown receiving. Cohen clearly has a role in this offense, and that makes him worth a speculative fantasy add after week 1.

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