It’s no secret how the Patriots have managed to remain on top of the NFL for so long: Their all-world quarterback does not get paid like other franchise quarterbacks do. That gives Bill Belichick and the front office the cap flexibility he needs to improve the roster. Rarely do Super Bowl champs manage to bring in more talent during the following offseason, but the Patriots did in 2017, thanks to Brady and his relatively small cap hit.

Brady will cost New England just $14 million against the cap in 2017. There are 19 quarterbacks who will cost their teams more. He is easily the league’s most underpaid player, but he’s not the only star making less than he’s worth.

Here are the NFL’s 10 biggest bargains in the league for 2017…

(Note: Players still on their rookie contracts were not included in this list.)

1. Tom Brady, QB Patriots

2017 Cap hit: $14 million

Position rank: T20th

Fun fact (for everyone outside of Chicago): In 2017, Mike Glennon will cost the Bears as much money as Tom Brady costs the Patriots.

2. Rob Gronkowski, TE Patriots

2017 Cap hit: $6.75 million

Position rank: 9th

In addition to the most underpaid player, the Patriots also have the second most underpaid player on their roster. Credit goes to Bill Belichick for this one. He knew what he had in Gronk just two years into his rookie deal and locked him up for six years at just $9 million per year. Gronkowski’s cap hit jumps up to double figures for the 2018 and 2019 seasons, but that’s still a bargain for the best tight end in the game.

3. Casey Hayward, CB Chargers

2017 Cap hit: $5.08 million

Position rank: 31st

By a lot of measures, Hayward was the best cornerback in the NFL in 2016. Not bad for a player who was seen as little more than a solid slot corner in Green Bay. The Chargers asked Hayward to cover opponents’ best receiver every week and he answered the bell, leading the league in interceptions and locking down pretty much every receiver he matched up with.

I was the best corner in the League last year.#1 ints, #6 in PBU, #3 in passes def, #3 in QBR and matched #1 wr most of the year👀. #NoDebate — Casey Hayward (@show_case29) May 16, 2017

4. Donald Penn, LT Raiders

2017 Cap hit: $7.15

Position rank: 19th

Penn is one of the anchors on the league’s best pass-blocking unit. He allowed just one sack in 2016 over 16 games. One sack! It was a costly sack though, as it resulted in a season-ending injury for Derek Carr. That doesn’t change the fact that Penn is vastly underpaid. He’s an elite tackle being paid like a below average one.

5. Richie Incognito, LG Bills

2017 Cap hit: $4.92 million

Position rank: 22nd

Well, we all know why Incognito isn’t paid more money. The bullying scandal in Miami dropped his asking price considerably. The Bills have benefited. Incognito is one of the NFL’s best run blockers and a big reason Buffalo’s running game has been so effective these past few seasons.

6. Tyrod Taylor, QB Bills

2017 Cap hit: $9.71 million

Position rank: 22nd

Another reason the Bills running game has been so effective: Tyrod Taylor’s legs. The Bills QB remains underrated. He’s a solid passer and his running ability makes him a top-20 starting quarterback. Is he a franchise guy? No, but he’s being paid like a good backup, and he’s so much more than that.

7. Eric Berry, S Chiefs

2017 Cap hit: $5 million

Position rank: 22nd

Berry’s cap hit will jump to $13 million in 2018, but, for now, he remains a bargain for Kansas City. He’s one of the few game-changing safeties in the league. Just ask Falcons fans, who watched Berry single-handedly beat their team late last season.

https://www.youtube.com/watch?v=IRsASgWk5as

8. Travis Frederick, C Cowboys

2017 Cap hit: $4.51 million

Position rank: 9th

Frederick is the best center in the game, but eight centers make more than him after he converted most of his salary into a bonus. The result: Dallas saved about $10 million in cap space in 2017, and Frederick lands on this list.

9. Mario Addison, DE Panthers

2017 Cap hit: $4.35 million

Position rank: 35th

Remember this name. Addison was unblockable off the edge last season and managed to rack up 9.5 sacks despite playing in a reserve role. With Kony Ealy shipped off to New England, the Panthers will ask Addison to play more. He’s a dark horse to lead the league in sacks if he can keep going at the rate he did a year ago.

The best of the best on the edge pic.twitter.com/v0znHLSMmJ — Pro Football Focus (@PFF) July 2, 2017

T10. Brent Grimes, CB Buccaneers

2017 Cap hit: $8 million

Position rank: 24th

T10. Brandon Marshall, WR Giants

2017 Cap hit: $4.46 million

Position rank: 39th

We’ve lumped these two together because they’re underpaid for the same reason: Both are on the wrong side of 30 and were let go by former teams in cost-cutting moves. But both Marshall and Grimes are still producing at a high level. Grimes remains a lockdown corner, and Marshall still commands double teams on the outside.