Brighton drew first blood, taking the lead in the 13th minute when a well-executed short corner routine resulted in Kaoru Mitoma heading the ball across the box, and Danny Welbeck fired home with a first-time drive.
However, Chelsea's recent acquisition, French forward Christopher Nkunku, quickly leveled the score in the 19th minute with his second pre-season goal since joining the London club from RB Leipzig for a reported £63 million ($80 million).
Brighton's fortunes took a turn for the worse in the 59th minute when Dutch full-back Jan Paul van Hecke received a second yellow card after a reckless challenge on Cesare Casadei, leaving Brighton with ten men on the field.
Seizing the opportunity, Chelsea capitalized on their numerical advantage and surged ahead just five minutes later. Ukrainian talent Mykhailo Mudryk, who had been eagerly awaited by fans, burst in from the left and, after a smart exchange with Nicolas Jackson, unleashed a powerful drive into the bottom corner from outside the box. This goal marked Mudryk's first for Chelsea, following his high-profile transfer to the club in January, reportedly costing up to 100 million euros (£88 million, $108 million).
As the game progressed, Senegal international Nicolas Jackson showcased his abilities as he set up Conor Gallagher for Chelsea's third goal, solidifying their lead. Jackson then demonstrated his scoring prowess by netting the fourth goal for Mauricio Pochettino’s team.
Brighton, despite being down to ten men, fought back and was rewarded with a 79th-minute penalty converted by Joao Pedro, giving them a glimmer of hope. However, Chelsea's defense held firm, denying Brighton further opportunities to level the score.
The game saw an exciting late twist when Brighton's substitute Deniz Undav managed to score a late third for Albion, adding tension to the closing moments of the match. However, Chelsea remained resolute, securing their 4-3 victory.
With this thrilling friendly match now in the books, Chelsea's focus turns to their next opponent in the Premier League Summer Series. On Wednesday, the London club is set to face Newcastle United in Atlanta, promising another exciting encounter for football enthusiasts worldwide.