Richard Sherman had a monster game Sunday night. (Elaine Thompson / AP)

The Seattle Seahawks did a number on the San Francisco 49ers in a 42-13 win Sunday night and, over their last three games, have outscored opponents 150-30, winning four in a row. Now, though, they face the prospect of losing one of their best defensive players.

Richard Sherman, the second-year cornerback out of Stanford, has developed into one of the best pass defenders in the NFL and on Sunday night, he was everywhere: returning a blocked field goal 90 yards for a touchdown and intercepting Colin Kaepernick in the fourth quarter.

The problem is that Sherman tested positive for Adderall, a banned substance unless prescribed by a doctor, in November. Sherman’s teammate, Brandon Browner, also tested positive and began serving his four-game suspension immediately. Sherman appealed his four-game ban and spent Friday in New York arguing his case, although player appeals are rarely successful.

“We made our appeal, we made a strong case,” Sherman said on the NFL Network. “They violated the chain of custody and unless they just say they can break rules and players can’t, well that was their argument. So hopefully it goes the players’ way and they uphold, you know, the rules.”

Sherman contends that the cup containing his urine specimen for testing leaked and the person collecting the sample placed a second cup, which had a broken seal, beneath the first one. Sherman should hear from the league next week. And if he loses?

“I won’t be disappointed at all, to tell you the truth,” Sherman said (via Yahoo’s Doug Farrar). “It is what it is. It will be a decision by the league, and I’m sure my teammates will go out there and show up like we always do. The next man will step up and do a great job, and I’m not worried at all.”

If suspended immediately, he’d miss the Seahawks’ regular-season finale and a good chunk of the playoffs. 

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