No meaningful changes in the 2019 ATP Calendar. 63 tournaments will be played in 31 countries across six continents. The system and structure are the same as the ones adopted by 2009 both in terms of dates and format: four Grand Slams, 9 Masters 1000s, 13 ATP 500, 39 ATP 250.
The only very important change is the 250 category: in the first week of May, at the same time as Munich and Estoril, Istanbul is not there anymore. The Turkish event was launched in 2015 featuring the Champion Roger Federer.
In that block, the ATP kept a spot open writing "TBD". The competition will start on December 31 with Brisbane, Doha and Pune (as well as Hopman Cup) and ends on November 24 with Davis Cup final. NextGen Finals will be played from Monday to Friday, one day earlier than 2017 and 2018, and ATP Finals from Monday to Monday, one day later.
Indian Wells and Miami will start on Monday too. No Masters 1000s won't be upgraded to a Super Master category: it was reported that the duration of Madrid, Rome and Shanghai could have been increased, and instead, they will still be played from Sunday to Sunday.
The total on-site prize money will be equivalent to $137.5 USD million, with a +110% increase from 2008. In 2017 4.5 million people attended ATP events overall and 995 million people watched tennis on TV and Internet. In 2020 some big changes are expected, with the World Team Cup likely to be introduced in the first ten days of January.
You can see full 2019 calendar here ALSO READ: Roger Federer to decide on playing in Dubai 'next week'