After eight days of thrilling Nitto ATP Finals action at The O2 in London, Alexander Zverev earned the biggest title of his career. The 21-year-old German defeated World No. 1 Novak Djokovic 6-4, 6-3 on Sunday, but which moment did fans inside the world famous venue in South East London connect most with? Infosys ATP Fan Meter has the answer.

Recording decibel levels inside Centre Court throughout the tournament, the Top 10 moments from the elite eight-man event have been confirmed. Six of the eight players competing for the trophy at the season finale made the Top 10 winning list, with all eight man featuring in matches containing Top 10 moments.

Leading the way, with three entries in the Top 10, is Roger Federer. The six-time champion was responsible the loudest reaction of the tournament in his opening match against Kei Nishikori, with the crowd reaching 110dB as they rallied behind the 16-time ATPWorldTour.com Fans' Favourite award winner after an exquisite forehand lob in the second set. That level of sound isn't unfamiliar to regular visitors to The O2, but this time there were no microphones, drums or guitars.

The opening singles match of the tournament provided the second loudest moment of the event, as Dominic Thiem fired a cross-court forehand winner late in his epic second-set tie-break against Kevin Anderson. Despite falling to the South African in straight sets, Thiem won the hearts of the crowd, who responded with an impressive 108dB for his fearless efforts. Thiem almost beat that figure in his following match, notching 106 dB with a solid overhead under pressure in the second set against Federer.

Runner-up Novak Djokovic makes two appearances in the list, hitting 107dB and 106dB in his first and final Group Guga Kuerten encounters, respectively. The five-time champion impressed the London crowd with a backhand winner down the line against Isner in his opening match, before stunning Marin Cilic with his phenomenal defensive skills as he completed group play with a 3-0 record.

No list would be complete without an entry from the champion in the final match of the ATP World Tour season. With 104 dB, Zverev earned his spot in the Top 10 late in the first set of the championship match. The German became the first man to break Djokovic's serve throughout the tournament as the World No. 1 misfired on his forehand side.

Marin Cilic and Kei Nishikori complete the Top 10, lifting the crowds in their fourth appearances at The O2. The 2014 US Open finalists proved finesse can be just as effective as power, with Cilic clocking 105dB for a stellar drop volley against Zverev and Nishikori hitting 104dB for an imaginative slice backhand in his round-robin loss to Anderson.