International Series Gold tournaments offered players cash prizes (purses from $755,000 to $1,426,250 as of 2008) and the ability to earn ATP ranking points.
See Association of Tennis Professionals#ATP rankings for more details.
The "500" represents the number of ATP ranking points earned by the winner of each event in the series.
The tournaments, in calendar order, are: Players with 3 or more titles ^ RO = Rotterdam, ME = Memphis, DU = Dubai, AC = Acapulco (Mexico City), BA = Barcelona, ST = Stuttgart, KI = Kitzbühel, TO = Tokyo, PA = Paris, EX = Extinct tournaments.
^ The 4th International Series Gold tournament was played in Mexico City in 2000, before moving to its current location in Acapulco in 2001.