By including two extra Grand Slams to his assortment in 2019, Djokovic took his general haul to 16 – 4 fewer than Swiss legend Federer, 38.
Prolific French Open-winner Rafael Nadal sits second within the checklist with 19 however Henman believes Djokovic can proceed to dominate lengthy after Federer – and attainable Nadal – retire.
The former British primary stated: ‘I look at Novak’s physique and you’d suppose he might be like Federer and play into his late 30s.
‘If he has the mental capacity and motivation to keep working hard that’s an actual chance.
‘I think his game is less demanding physically. Obviously he’s an amazing athlete and does loads of operating, however while you take a look at Rafa there’s an infinite quantity of stress that goes by his physique, notably together with his fashion of play on clay.
‘I think Djokovic has got plenty of years at the top ahead of him.’
Djokovic, who this yr gained Wimbledon and the Australian Open, made an excellent begin to his ATP Finals marketing campaign on Sunday, smashing Matteo Berrettini 6-2 6-1 on the O2 Arena in London.
The 32-year-old reached the ultimate of the season-ending occasion 12 months in the past earlier than dropping to Alexander Zverev within the ultimate.
Speaking after his one-sided win over Berrettini, Djokovic stated: ‘It feels nice to be again in London. Over the years I’ve performed effectively on this area and this occasion.
‘I knew [Matteo] would be nervous at the start of the match so I tried to use my experience and tactics to perform well. I managed to play solidly throughout.’
On Tuesday, world quantity two Djokovic faces Austrian star Dominic Thiem, who surprised Roger Federer in his opening match on Sunday night.