Luton Town boss Rob Edwards praised senior pair Ross Barkley and Andros Townsend after their 1-1 draw with Liverpool.
Tahith Chong had Luton 1-0 ahead on 80 minutes and the hosts entered stoppage time still with the lead.
But substitute Luis Diaz leapt highest to head home a Harvey Elliott cross to score on 95 minutes.
Edwards later said, "I'm really proud of the whole football club today. It was a big day for us against a big club. We showed a lot of quality in the game.
"I think so [their best 90-minute performance]. It shows you have to for 98 or 99 minutes to get something. I was pleased with our counter-attacking.
"We kept Liverpool thinking there's something to think about here and the goal was the best example of that.
"The players have improved. There were elements of our game a team like this would have exposed.
"Belief. We're going around things the right way. We have a lot of injuries. There are five players who could have started.
"I thought Ross was excellent, Andros too. A lot of the counter-attacking moments came from Ross. He is able to get away and find the space. The goal was the best example of that."