ATP Masters 1000 tournaments
The ATP Masters 1000 tournaments, also known as Masters 1000 or ATP 1000 events, are an annual series of nine tennis tournaments featuring the top-ranked players on the ATP Tour since its inception in 1990. The ATP 1000 events sit below the Grand Slam tournaments and the year-end championships in prestige on the annual ATP Tour calendar; these tournaments plus the quadrennial Summer Olympics are collectively known as the 'Big Titles'.
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