Tottenham Hotspur's manager, Ange Postecoglou, admitted that his team fell short in their performance during the north London derby against Arsenal. Spurs were defeated 2-1 at the Emirates Stadium, allowing Arsenal to complete a Premier League double over them. Despite taking an early lead through Son Heung-min, Tottenham have now squandered 18 points from winning positions this season, second only to Fulham with 19.The loss left Tottenham in 13th place in the Premier League standings and extended their winless streak to five league games. Additionally, they have failed to secure a victory in their last six encounters with Arsenal. Postecoglou expressed his dissatisfaction with the team's performance, particularly in the first half. "Nowhere near good enough, especially in the first half," he told TNT Sports.Son Heung-min echoed his coach's sentiments after his goal was negated by Dominic Solanke's own goal and Leandro Trossard's decisive strike for Arsenal. "Very disappointing," said Son. "This game means a lot to the club and fans." The Spurs captain acknowledged that they were too passive and lacked discipline during the match.Postecoglou took responsibility for the team's shortcomings, emphasizing that it was up to him to prepare the players better. He stressed the importance of improving their play and lamented the numerous losses this year. "Ultimately, the responsibility lies with me and how I prepare the players," he stated.Son also highlighted the need for improvement across all aspects of their game. He pointed out that they must listen to instructions and maintain discipline on the field. "We always want to press and play as high up as possible," Son added.The defeat underscored Tottenham's struggles this season, as they continue to drop crucial points from advantageous positions. Their current standing in the league table reflects these challenges, prompting both players and management to seek solutions urgently.