Premise: The 2007 Porsche Tennis Grand Prix was a tennis tournament played on indoor hard courts. It was the 30th year of Porsche Tennis Grand Prix, and was part of the Tier II Series of the 2007 WTA Tour. It took place at the Porsche Arena in Stuttgart, Germany, from October 1 through October 7, 2007
Hypothesis: The 2008 Porsche Tennis Grand Prix took place at the Porsche Arena in Stuttgart, Germany, from October 1 through October 8, 2008.