Marshall will be the latest tough assignment for Webster.
The Giants' No. 1 corner has covered the opponents' top wideout week in and week out with Terrell Thomas out due to a torn ACL.
Webster welcomes the challenge presented by Marshall this Sunday.
"You can’t hide him because he is one of their playmakers," said Webster, who watched Marshall's up and down game against Darrelle Revis and the Jets. "I think they did a good job of trying to get him the ball. When we have the opportunity to make plays, we have to make some and hope that we make more than he does."
Marshall, a 6-4, 230-pound specimen, has just four touchdowns in 20 games with Miami. He put a bulls-eye on his back on Thursday night when he sent out a pseudo guarantee via his verified Twitter account.
"To: Media When we win Sunday please don't say the Giants didn't take us serious." Marshall tweeted.
Notice he didn't say "if."
Webster wasn't around to discuss Marshall's guarantee on Friday.
But he made it clear earlier in the week that he and the rest of the Giants won't be taking the winless Dolphins lightly.
"It doesn’t matter who we are playing or what their record is, our next best challenge is the next team on your schedule," Webster said. "Any given Sunday, anything can happen. Everybody is professional, everybody is good and anybody can win. They haven’t put it together yet but that doesn't [mean] that they are not going to be prepared and come out here and work hard to put their best foot forward. We have to do exactly the same and match their intensity and even be greater at that.
"We will get the W if we do those things and take care of our business," he added.
Webster has certainly been taking care of business the last few weeks.
He made two clutch picks in the Giants' Week 6 win over Buffalo, the second leading to the Giants' game-winning field goal. He limited Bills wideout Steve Johnson to five catches for 39 yards (one TD).
Seven days earlier, Webster held Seattle's Sidney Rice to four catches for 38 yards. Larry Fitzgerald caught eight passes for 102 yards against Webster and others in Week 4, but he was kept out of the end zone in the Giants' comeback win.
"I think he’s looked forward to every opportunity and every challenge," Tom Coughlin said earlier this week. "I think he’s focused on each outstanding player that he’s gone against. He’s studied them. He’s worked hard at it. He looks forward to the challenge and to this point, he’s done a good job of it."