NFL Draft 2015: Teams with the Most to Improve After 1st Round

Day 1 of the 2015 NFL draft has come and gone. And while many teams met critical needs with their first-round picks, there are a few who have a lot more to improve on in the subsequent rounds.

There are three teams in particular with the most to improve on. Naturally, two of the three were also the teams with the worst finishes in 2014.

Buffalo Bills

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The Bills sat Day 1 out after packaging their first-round pick to trade up and select Sammy Watkins at No. 4 in 2014. This makes Day 2 and 3 that much more critical.

Competition for the team's starting quarterback role kicked off this week at their veteran minicamp. EJ Manuel, Matt Cassel, Jeff Tuel and Tyrod Taylor are vying for the position; however, there is no clear front-runner.

The Bills would be wise to consider drafting a young quarterback with the 50th overall pick. Former Baylor quarterback Bryce Petty is the best available, and according to Pro Football Talk, they've at least met with him.

Beyond that, the Bills also need to strengthen their offensive line. Pro Football Focus listed Buffalo at No. 30 on its final offensive line rankings for the 2014 season.

Cleveland Browns

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The Browns were on the other end of the deal with the Bills, selecting two first-round picks on Thursday: defensive tackle Danny Shelton from Washington at No. 12 and offensive lineman Cameron Erving from Florida State at No. 19.

Both picks met team needs. However, there are more needs to be met.

Cleveland's next priority should be a wide receiver, considering the 22nd-place finish in receiving last season.

The team attempted to remedy the thin depth chart in the offseason by signing Dwayne Bowe and Brian Hartline, but neither are the long-term contributor the Browns need.

Among the receivers still available, Cleveland's best bet with the 43rd overall pick will likely be Jaelen Strong from Arizona State.

It also wouldn't be a bad idea to add on to Erving by beefing up the offensive line some more in late rounds. 

Tennessee Titans

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Tennessee selected Marcus Mariota at No. 2 after turning its cheek to a generous offer from the Philadelphia Eagles. But regardless of how flashy the pick was, the team still has critical needs to address.

Its first priority should be the offensive line.

Like the Bills, the Titans finished low on Pro Football Focus' 2014 offensive line rankings, coming in at 28th. 

The team needs a right tackle. Fortunately, it'll open the second round where Pittsburgh's T.J. Clemmings and Oregon's Jake Fisher will still be available.

The Titans should also consider a running back to balance the young Mariota, who the team expects to be its Day 1 starter, per ESPN's Paul Kuharsky. And there's a good chance Alabama's T.J. Yeldon will still be available at the start of the third round.