Tottenham saw a 2-0 lead slip away from them as they went on to lose 3-2 away at Brighton.
It was a great first half for the Lilywhites, scoring twice with the man on form Brennan Johnson grabbing yet another goal, and James Maddison grabbing the second, Spurs finished the first half with the scoreline reading 2-0.
However, the second half was terrible for Spurs, conceding three and throwing away their two-goal lead in just 20 minutes.
Spurs went on to lose their game at the AMEX 3-2 after an utterly abysmal defensive display cost them massively in the second half.
Here's what we learnt from the game:
Spurs have major defensive problems
A common theme all season has been Spurs' defensive mistakes, and it was on display yet again at the AMEX.
Spurs full-back Destiny Udogie fluffed his lines when attempting to clear the ball from a Brighton cross, which led to Yankuba Minteh scoring the first for Brighton.
Spurs were also caught sleeping for Brighton's equaliser and allowed Georginio Rutter to easily hit the back of the net.
For the third, Udogie and Rodrigo Bentancur were both beaten easily by Rutter, who found an unmarked Danny Welbeck in the box to head home.
Yet again, individual mistakes cost Spurs, a problem which has not only been at the club this year, but also for many seasons.
Letting a 2-0 lead slip after a good first-half performance is unacceptable and needs to be worked on massively to avoid the constant defensive mistakes.
Brennan Johnson is a vital player for Spurs
Brennan Johnson netted Spurs' first goal of the match, with a cute finish past Mark Verburggen.
The Welshman scoring meant that it was his sixth consecutive game he's scored in - in all competitions.
Johnson also put in a great first-half display, causing the Brighton defenders trouble, with both his pace and skill.
Unfortunately for Johnson, he was isolated in the second half and couldn't do the work that he did in the first half.
Despite the overall team performance, Johnson proved doubters wrong yet again and showed why he should always be starting for the club.
Timo Werner still can be a key player
Timo Werner has been under a lot of scrutiny by fans recently, mainly for his final product, but the Spurs forward still works hard week in and week out.
Werner managed to pick up an assist against Brighton, assisting James Maddison's goal, and using his blistering pace down Spurs' left-hand side.
Werner's shooting ability still let him down, however, he was proving to supporters that his build-up play is key.
For Werner, it is a confidence game now, and once he starts scoring, more goals will come from him and the team.
Ange Postecoglou needs to make changes quicker
A key issue brought up by Spurs fans this season is Ange Postecoglou's reluctance to make changes, and the game against Brighton was no different.
Despite being 2-0 up, Postecoglou decided to still attack them, leaving the defence open and subject to mistakes, which happened and ultimately led to Spurs' loss.
Alongside the reluctancy to change tactics in the game, the Australian also didn't make the first substitution until the 79th minute, in which he brought off an attacker and a midfielder for two midfielders. The decision was made at 3-2 down.
Postecoglou has said multiple times that his team will "not change" no matter the scoreline or the way they have been playing, but the problems are starting to show when teams are figuring out the tactics quite easily.