The Stuttgart Open known as the BOSS Open and formerly as the Mercedes Cup for sponsorship reasons, is an annual tennis tournament held in Stuttgart, Germany and belongs to the ATP Tour 250 category.

The event was part of the International Series Gold tournament series within the ATP, has been held since 1978 and was played on clay until 2014, while since 2015 it has been played on grass.

The most titled players in the tournament's roll of honor are the Spaniard Rafael Nadal, with three victories (two on clay, one on grass), the Argentine Martín Jaite, the Austrian Thomas Muster and the Brazilian Gustavo Kuerten, with two victories each. The 2020 edition is not held due to the COVID-19 pandemic.

The Porsche Tennis Grand Prix is a women's tennis tournament held in Stuttgart, Germany. Born in 1978, the tournament was part of the Tier II circuit from 1988 to 2008 to then become one of the Premiers from 2009 to 2020, and finally a WTA 500 from 2021.

From 2007 to 2019 it collected 10 awards for best category tournament. The winner of the singles tournament, in addition to the prize money, also receives a Porsche car. The 2020 edition is not held due to the COVID-19 pandemic.