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The ATP 250 tournaments (previously known as the ATP World Tour 250 tournaments, ATP International Series, and ATP World Series) are the lowest tier of annual men's tennis tournaments on the main ATP Tour, after the four Grand Slam tournaments, ATP Finals, ATP Masters 1000 tournaments, and ATP 500 tournaments. As of 2024, the series includes 38 tournaments, with 250 ranking points awarded to each singles champion—which accounts for the name of the series. Draws consist of 28, 32, or 48 for singles and 16 for doubles. In 2025, the series includes only 30 tournaments after retirement of five tournaments (Atlanta, Cordoba, Estoril, Lyon, Newport) and upgrades of three tournaments to the 500 level (Dallas, Doha, Munich).
Thomas Muster holds the record for most singles titles at 26, while Mike Bryan holds the record for most doubles titles won with 46.