Tottenham Hotspur travelled to the Amex off the back of wins in both the Premier League and the Europa League, with hope they could successfully carry on their winning streak of 6 wins in their last 6 games in all competitions.
Brighton on the other hand are unbeaten at home this season their most recent results at the Amex being draws against Nottingham Forest and Ipswich.
Tottenham started the half in control of the game and you could see the result of that in the 0-2 score line at half time with goals scored by in form Brennan Johnson, who has 6 goals in 6 games, and James Maddison.
After being behind at the break, Brighton turned the game on its head scoring three goals in 18 minutes, causing Tottenham Hotspur to fall apart and meant the Seagulls went on to win the match.
'Feedback is what I believe in'
Ange Postecoglou spoke to the media and when asked on whether he let the players know his thoughts after the game he stated, "Feedback is what I believe in. I'm sure they are disappointed. I don't care. I am disappointed, the fans are disappointed."
Postecoglou described Tottenham’s performance as lacking intensity, he said in the press conference, "We didn't compete, lost the duels and we lacked intensity."
After scoring their first goal in the 48th minute, Brighton stole the show and score their next two within eighteen minutes, Tottenham became unrecognisable to the team they were in the first half.
After their poor performance in the second half, Ange Postecoglou was asked about the contrast of their first and second half performance.
"That's a real stark reminder of what elite sport is about. The core of it is competitive. If you're not competitive it doesn't matter how good you are or how good you think you are, you're going to trip up."
‘We've usually dealt with it pretty well’
The Tottenham Hotspur boss discussed whether he saw this coming at half time after being so dominant in the first half.
"Well like I said, I haven't seen it before, and I certainly didn't feel like that's the way the game was going to go.
"You understand that at 2-0 obviously they're going to come out and be fairly aggressive in their approach, but that's not the first time we've faced that and we've usually dealt with it pretty well. But obviously today we failed to do the things we needed to do," Postecoglou told the reporters.
Postecoglou discussed with the media whether he had seen a learned something new about his Tottenham side this evening at the Amex.
"I don't know if I learned something new, but I certainly experienced something new."
The Tottenham boss had a chance to explain how his players weren’t overconfident with their win streak behind their back, and how important winning their last games previous was.
"Look, it's not a couple of positive results. It was five wins, let's just keep things in context here.
"I understand the extremes of what we do. What I'm saying is that we didn't do the basics of everything we've done to get to this point, good, bad or otherwise.
"Even when we didn't win at Newcastle, we played well and fought hard to the last second to win that game of football. We didn't do that today and every time we've played that's been an element of our game but I didn't see that today."