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The ATP Masters 1000 tournaments (previously known as ATP Masters Series) are a series of 9 top-level tennis tournaments that features the best men's tennis players on the ATP Tour calendar since its debut in 1990. The events are held annually in Europe, North America and Asia. The tournaments are important for the top male players on the professional circuit as the series constituted the most prestigious tournaments in men's tennis after the four Grand Slam events.

Results in ATP Masters 1000 events earn players more ranking points than regular tournaments but less than Grand Slam events or the year-end ATP Finals. Up until 2007, most Masters Series finals were contested as best of five-set matches. Currently, all Masters Series matches (including the finals) are decided in best of three-set matches.

In singles, Novak Djokovic holds the record for the most titles with 36 since the Masters Series began in 1990. Djokovic is the only player to complete the Career Golden Masters by winning all nine Masters 1000 singles titles, which he did in 2018. Roger Federer, Andre Agassi, Andy Murray, and Rafael Nadal have each won seven different titles. In 2020, Djokovic completed his second Career Golden Masters.

In doubles, the Bryan brothers (Bob and Mike) have won a record 39 doubles titles, all as a team. Daniel Nestor and the Bryan brothers have each won all nine titles throughout their careers.

History
The series was introduced in 1990 with the inception of the ATP Tour by bringing together the nine most prestigious tournaments of the preceding Grand Prix tennis circuit. Results in ATP Masters Series events earned players more world ranking points than regular tournaments, though not as many as Grand Slam events or the year-end ATP World Tour Finals. Up until 2007, most Masters Series finals were contested as best of five set matches, but from 2008 all Masters Series events were decided in best of three set matches.

As part of a shake-up of the tennis circuit in 2009, the Masters Series became the ATP Tour Masters 1000, with the addition of the number 1000 referring to the number of ranking points earned by the winner of each tournament. Contrary to earlier plans, the number of tournaments was not reduced from nine to eight and the Monte-Carlo Masters remained part of the series although, unlike the other events, it does not have a mandatory player commitment. The Hamburg Masters event was downgraded to an ATP Tour 500 event. The Madrid Masters moved to May and onto clay courts. A new tournament in Shanghai replaced the Hamburg Masters and took over Madrid's former October indoor slot. In 2011, six of the nine "1000" level tournaments were combined ATP and WTA events.

Historic names
1990–1995

ATP Championship Series, Single-Week

1996–1999

ATP Super 9

2000–2003

Tennis Masters Series

2004–2008

ATP Masters Series

2009–2018

ATP World Tour Masters 1000

2019–present

ATP Tour Masters 1000

ATP Points

 * Players with byes receive first round points.

Tournaments
Currently, the following nine tournaments are part of the ATP Masters 1000: Canadian Open (alternating yearly between Montreal and Toronto), Italian Open (held in Rome), Indian Wells Masters, Miami Open, Monte-Carlo Masters, Madrid Open, Cincinnati Masters, Shanghai Masters and Paris Masters. Since 2009, five of the tournaments are held on outdoor hard courts, three on clay and one on indoor hard court whereas from 1987 until 2008 there were two indoor tournaments at the top-9 level. There are no grass-court Masters 1000s.

In 2009, the Shanghai Masters replaced the Madrid Open, until then held as an indoor event, in the eighth slot of the year with the Madrid Open switched to clay courts replacing the Hamburg Open in the spring clay.court season. The Shanghai Masters was designated as an outdoor event despite the facility having a retractable roof and having been used as the indoor venue for the ATP Finals (then called the Tennis Masters Cup) from 2005 until 2008.