Stuttgart's ATP claycourt tournament will become a grass-court event from 2015, with organizers promoting it as a key Wimbledon warm-up.

The tournament's request to move to grass and take place the week following the French Open was approved by the ATP Board of Directors at its recent meeting in Miami.

With Wimbledon taking place a week later in the calendar from 2015, a three-week gap will be incorporated in the calendar in between Roland Garros and the season's third Grand Slam event, meaning an additional week of tournaments.