TheATP 500 tournaments (previously known as theATP World Tour 500 tournaments,ATP International Series Gold, andATP Championship Series)[1] are the fourth-highest tier of annual men's tennis tournaments, after the fourGrand Slam tournaments,ATP Finals, and theATP Masters 1000 events. The winners of each tournament are awarded 500ranking points—which accounts for the name of the series.
As of2025, the series includes 16 tournaments,[2] which have draws of 32 for singles (except for theWashington Open: 48) and 16 for doubles. Leading players must enter at least four 500 events, including at least one after theUS Open; if they play fewer than four, or fail to play in one after the US Open they get a "zero" score towards their world ranking for each one short.
Roger Federer has won the most ATP 500 singles titles (24), whileDaniel Nestor has won the most doubles titles (20).