Seattle Seahawks cornerback Richard Sherman said Monday he has no problem with his ongoing Twitter banter with Arizona Cardinals cornerback Patrick Peterson, but he still has issues with San Francisco 49ers wide receiver Michael Crabtree. Peterson recently became the highest-paid cornerback in the NFL with a $70 million deal that includes $48 million guaranteed. Sherman signed a new contact in the spring worth $56 million, with $40 million in guaranteed money. So Sherman and Peterson have continued to take verbal shots at each other on Twitter about which player is the best corner in the league. "It's all fun," Sherman said Monday on 710 ESPN Seattle. "We're just trying to see who's the most clever. We're friends. We've known each other since the [NFL] combine [in 2011]. We've worked out together and he's a great dude." Peterson said last week that he also has fun with his tweets to Sherman. So are Sherman's feelings about Peterson different from his feelings about Crabtree? "Much, much different," Sherman said. Sherman's national TV rant against Crabtree moments after the NFC Championship Game in January was one of the most talked-about incidents of the season.