Sam Bradford agreed to a six-year, $78 million contract with the St. Louis Rams on Friday night, with $50 million in guaranteed money. The guaranteed money is the highest ever in the NFL. Sources told ESPN that the deal can be worth as much as $86 million.

The 49ers have signed top rookies Anthony Davis and Mike Iupati to five-year contracts. Davis' five-year deal is for $26.5 million, with $15.954 million guaranteed, a source told ESPN Insider Adam Schefter. San Francisco also signed rookie safety Taylor Mays and rookie linebacker Navorro Bowman to four-year deals Friday.

The Cowboys have signed former UTSA track star Teddy Williams to be with them in training camp. Williams hasn't played football since breaking his ankle as a senior wide receiver in high school. He signed with Dallas as a cornerback. "It's just a great feeling to be back on the field ... and to compete with the best in the world," said Williams, a four-time All-American sprinter.

Tim Tebow and the Broncos have agreed to a five-year, $33 million contract, with $8.7 million guaranteed. Tebow missed three practices before coming to terms and likely will report to the Broncos for Friday morning's workout. Training camp officially starts Sunday with the first full-squad, full-pads session.

The Patriots have agreed to terms with first-round draft choice Devin McCourty on a five-year contract. The deal has a maximum value of $13.2 million, according to a league source and includes guarantees and bonuses of $7.825 million. McCourty, a cornerback from Rutgers, was the 27th overall selection in the draft.

The Patriots have signed second-round pick Brandon Spikes to a four-year, $3.21 million contract. The deal includes a $960,000 signing bonus and a one-time incentive of $450,000, according to agent Terry Watson. Spikes, a linebacker, was the final pick of the second round.

The Browns have signed rookie running back Montario Hardesty to a multiyear contract. Cleveland announced the signing Monday. Hardesty was a second-round draft pick acquired from Philadelphia for a third-rounder and two fifth-round selections.

The Patriots have signed tight end Rob Gronkowski to a four-year, $4.44 million contract. Per a league source, Gronkowsi's deal pays a signing bonus of $1.76 million and a one-time incentive based on minimum playing time in the amount of $830,000.

The Giants have signed free-agent linebacker Keith Bulluck. Bulluck worked out with the Giants on Friday in oppressive heat at the New Meadowlands. Coming off ACL surgery just seven months ago, with no team to supervise his recovery, Bulluck spent most of his spring rehabbing in New York.

The Dolphins have signed unrestricted free-agent defensive end Marques Douglas to a two-year, $2.5 million contract, according to a league source. It was widely speculated that the Jets would re-sign Douglas, but the team showed no interest.