Jose Mourinho previously held the Real Madrid club record, having won 77 of his first 100 games in charge at the Bernabeu.
He moved ahead of Miguel Munoz, who registered 70 victories when he took charge in 1959, and, although often coming under criticism with Madrid, he was statistically their best ever manager in his debut 100 games.
When he left Madrid to rejoin Chelsea at the start of last season, Mourinho was replaced by another ex-Blues head coach - Carlo Ancelotti. 55-year-old Ancelotti spent two years at Stamford Bridge, winning the Premier League and FA Cup in 2010, and bringing a display of attacking football to Stamford Bridge not seen for many years. He left in 2011 to join PSG, where he also won a league title, before linking up with Madrid in the summer of 2013.
Ancelotti's debut season in La Liga saw Los Blancos claim La Decima - winning their 10th Champions League title - as well as the Copa del Rey, and he is spending this season attempting to lead the club to the La Liga title.
Currently, Madrid sit in first place in the league, four points clear of Barcelona and seven clear of Atletico Madrid in second and third place respectively. They overcame Elche by a 2-0 scoreline on Sunday to ensure this gap remained at the end of the game week, and it also brought a new record to Ancelotti - who moved ahead of Mourinho in Madrid’s history books.
With Mourinho registering 77 wins in his first 100 Madrid games, the victory over Elche ensured that Ancelotti went one game better, and now sits on a record of 78 wins in his first 100 games - making him the best debut coach Madrid have ever had, as per Marca.
With Ancelotti impressing as he is, the only question that remains is how far he would have taken Chelsea if not dismissed from his role at Stamford Bridge?