Maria Sharapova's first opponent following her 15-month doping ban has questioned the decision to give the Russian wildcards on the WTA Tour.
Sharapova plays Italy's Roberta Vinci in the first round of the Porsche Grand Prix in Stuttgart on Wednesday.
The 30-year-old's wildcard entry has already been called "disrespectful" by ex-world number one Caroline Wozniacki.
"I don't agree about the wildcard here and about the wildcard in Rome and the other tournaments," said Vinci, 34.
Sharapova was given a two-year ban last year, backdated to 26 January 2016, after testing positive for heart disease drug meldonium at the Australian Open.