The hosts dominated the first half at Molineux against an unusually sluggish and sloppy Liverpool, Hwang Hee-chan stroking in a 7th minute goal after a brilliant run from Pedro Neto, before Wolves missed a string of further chances.
“I thought the second half performance was impressive and we got what we deserved,” said Robertson.
“We can come up with excuses for the first half, like the international break and people travelling, but we made mistakes which we are not used to making.”
Wolves are 15th on three points.
“In the first half we had some problems physically, we weren’t sharp, we weren’t right. We tried to find out who’s ready [after the international break] and it was not a perfect choice,” said manager Jurgen Klopp.
“That’s why we changed pretty much everything in the second-half, tactically and physically. Second half, we controlled it completely and it was a really good game then. We deserved to win in the end, that’s clear.”
Wolves were left to rue missed opportunities, none more so than when Neto again beat his man to dink a cross into Matheus Cunha who inexplicably chested the ball instead of stooping to head home from close range and extend his team’s lead.
“It looks like a comfortable win for Liverpool but it wasn’t comfortable for most of the afternoon,” said Wolves manager Gary O’Neil. “When we were on top, we could have probably taken one or two more … To have pushed Liverpool so close was a great effort.”