RENTON, Wash. -- It's only July, but the war of words have already started between Richard Sherman and a divisional rival.
This one has to do with money.
The Arizona Cardinals' Patrick Peterson just received a five-year contract extension worth $70 million, making him the highest paid cornerback in the league.
That exceeds the $56 million extension Sherman signed earlier in the offseason.
And Peterson's windfall set off an entertaining, back-and-forth on Twitter between the two players. (Watch the video)
Peterson told ESPN.com that his ongoing Twitter feud with Sherman is all "just fun, healthy competition." But Peterson added, "Sometimes it seems like he's a little salty about it."
Meanwhile, it was announced that Sherman is the No. 1 rated player in the "Madden NFL 15" video game.
One disappointing moment in Seahawks training camp Wednesday came when defensive lineman Jesse Williams was carted off the field with a leg injury. His status is unknown -- but he did miss all of last year after knee surgery.