The Blades are one of two sides, along with Blackburn, yet to lose this season in the Championship, but couldn’t find a way past Pompey and their goalkeeper Will Norris.
League One champions Portsmouth are second from bottom having gathered just four points in seven matches, but Wilder doesn’t think they will stay down there for long.
“It wasn’t our day and maybe we didn’t deserve it, that’s how the game goes,” Wilder said.
“Portsmouth were good and you have to give them credit.
“If they play like that for all their home games and their away games, they will get results and they will win games.
“They will make it as difficult for other teams as they made it for us. Teams will get beaten here if Pompey play like that all season.”
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