Jordan Pickford insisted last month's blunder at Anfield had never dented his confidence after his match-winning display for Everton at Huddersfield.
The England goalkeeper's stoppage-time error in December's Merseyside derby gifted Liverpool all three points, but he proved the difference in his side's 1-0 win at the John Smith's Stadium.
Pickford produced two superb saves to help 10-man Everton preserve their slender lead after Richarlison's early goal and Lucas Digne's second-half dismissal.
When asked if it had been a testing time since his gaffe against Liverpool, Pickford said: "No not really. It doesn't affect me stuff like that.
"I know if I've done good or bad in games and I'm mentally strong. It's probably the strongest thing in my armoury.
"It doesn't affect me. I just put on performances and try my best every game."
Everton substitute Digne was shown a straight red card by referee Stuart Atwell for his trip on Adama Diakhaby and Aaron Mooy's subsequent free-kick was expertly turned away by Pickford.
But he saved his best until last, hurling himself full length to push away Elias Kachunga's 79th-minute header and ensure Marco Silva's side bounced back from Saturday's FA Cup upset at Millwall.
"It's part of my job and I don't think they're two 'worldie' saves, I think they're two good saves," Pickford said.
"It's all about where I am in the goal and I train hard and I know when to get in the right positions at the right time to give myself the best opportunity, which I felt I did."
Pickford said he was now focused on helping Everton secure three more points against Wolves at home on Saturday.
"The Premier League is a tough league, everyone knows that and it's all about getting back-to-back wins and going on a run," he added.
"We've been too inconsistent this season. We need to get that consistency level up and start by carrying on on Saturday."
Huddersfield's new manager Jan Siewert said after his first game in charge that he now knew why Pickford was England's number one.
Terriers goalkeeper Jonas Lossl was also impressed.
"From my point of view it was a great save. Definitely," said the Denmark international. "He did well. For the two he was called on, he did very well."
Lossl said he had been impressed by new head coach Siewert, who replaced David Wagner just over a week ago.
"It's been good," Lossl said. "He's come in with some spirit and some energy, so yes it's positive. Different manager, different ideas.
"I think he's done well and has been clear about what he wants. He has some good ideas and with his ideas I still believe."
Huddersfield, now 11 points from safety at the foot of the table, travel to Chelsea on Saturday and then take on Arsenal at home.
But Lossl said the mood in the Terriers' dressing room was still upbeat.
"We went to Chelsea last season and that's where we saved our season, so we have some good memories from there," he added.
"We know what's possible at Stamford Bridge, so we will believe."
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