Serge Aurier's first goal for the Club and Heung-Min Son's fourth in as many games secured a 2-0 win and back-to-back victories in the Premier League at Wembley after Stoke were beaten 5-1 on Saturday.
It was hard work against a well-drilled Brighton defensive display that often saw 10 men behind the ball.
We chalked up 25 efforts at goal to Brighton's seven and enjoyed over 75 per cent of possession.
However, clear-cut chances were at a premium against the visitors' packed rearguard. Harry Kane had an effort cleared off the line in the first with Erik Lamela - his first start for almost 14 months - and Sonny also close before Serge's cross sailed into the far corner to hand us the lead on 40 minutes.
Harry and Erik both struck the woodwork in the second half, Tomer Hemed hit Brighton's best chance at Hugo Lloris and Sonny wrapped it up with a glancing header from Christian Eriksen's free-kick three minutes from time - his first headed goal for us.
"It was tough, very tough," said Mauricio. "I'm happy in the end to win and three points is so important for us. I'm so pleased with the effort and the performance. It was a night to be patient, try to build and to play, play, pass, pass until finding the best option.
"The team was very good. I'm happy with the performance and it's good to be back in the top four. Now it’s important to try to keep this position but the season is so long and we need to go step by step."
On Serge's goal
Mauricio: "It was so important to open the game. For a new player to score is always good to feel the love of the fans and adapt himself in the team. I’m so happy for him."
On Erik's first start since October 22, 2016
Mauricio: "We’re so happy and he’s so happy. He feels again that he can play from the beginning (of a game). It’s good to feel to that you can play football again, so, so good and I’m sure he’s going to help us over the next six months."