The Seattle Mariners believe Fernando Rodney is tipping his pitches, part of what has led to his struggles on the mound.

Lloyd McClendon said before Monday's series opener with the Arizona Diamondbacks that his staff has been watching tape and there are some "dramatic" things that stand out and might have helped batters know what pitch is coming.

"Fernando was tipping some pitches. We've got to get that straightened out," McClendon said. "We've got to get him to the point where he's not tipping anymore, and I think you'll see him getting back to being productive again. When hitters know what is coming, it's a lot easier."

Rodney was pulled from the closer role in early June, but his struggles have continued. He has given up at least one earned run in six of his past eight appearances.