When teams and free agents start negotiations on Tuesday during what is known as the “legal tampering period,” everyone will understand this simple truth: There’s a lot of cap space to be spent, and not enough quality players to spend it on. That’s how we end up with news that Tampa Bay Buccaneers quarterback Mike Glennon could get $14-15 million per year.

It’s not a bad free agency class this year, but a lot of the bite was taken out of it by teams smartly using the franchise tag on key players or players like Cleveland Browns linebacker Jamie Collins signing extensions long before free agency started.

[ STACK: How Fournette’s heavier weight helped his NFL combine performance ]

Teams can officially start signing players on Thursday afternoon, and here are the 20 top players who are set to hit the market:

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More NFL free agency coverage from Yahoo Sports:
• A list of the the franchise-tagged players
• Some interesting possibilities at quarterback for a change
• An all-time great running back leads top skill-position players
• A couple of guards lead a thin offensive line group

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Frank Schwab is the editor of Shutdown Corner on Yahoo Sports. Have a tip? Email him at shutdown.corner@yahoo.com or follow him on Twitter!
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