The spokeswoman for Robinson Cano's foundation is listed as having been a client of the Biogenesis clinic last summer, although she denies having received anything from the clinic and says Cano "definitely never did."

Major League Baseball, however, has possession of a Biogenesis client roster that lists the spokeswoman, Sonia Cruz, and is investigating whether Cano had any relationship to the clinic, sources familiar with MLB's investigation told "Outside the Lines."

Cano has denied knowing clinic founder Tony Bosch or having ever used performance-enhancing drugs. But as his best friend, Melky Cabrera, his mentor, Alex Rodriguez, and now his spokeswoman have all been connected to clinic documents, MLB wants to know whether any relationship between Cano and the clinic exists.

Cruz, 31, says she was never a client of the Miami-area clinic at the heart of an ongoing performance-enhancing drug scandal, but records obtained by "Outside the Lines" list her as owing $300 in both July and August of last year. The records indicate that she paid the full balance in July, but the August records do not mention any payment.

Two former Bosch associates said the $300 monthly tab was consistent with a weight-loss regimen, not performance-enhancing drugs.

It was not clear whether the documents obtained by "Outside the Lines" were the same as the documents recently obtained by MLB.

When initially contacted by "Outside the Lines" last month, Cruz said she could not speak about the clinic and said, "I need to talk to Scott," referring to Cano's agent at the time, Scott Boras. Boras has since been replaced by agents at the Creative Artists Agency, but at the time said Cano had no connection to the clinic.

When reached again on her mobile phone Monday, Cruz denied having ever been a Biogenesis client.

"I met with a nurse who works for the clinic, but I met her outside the clinic just to talk to her about a diet program they have for women," she said. "I never went through with it once she explained what it was. I thought it was just a diet/nutritional thing, but it was diet, nutrition, pills and stuff."

Cruz said she was introduced to the nurse "by another person" and said she never followed up to find out what sort of pills the nurse was recommending. She said she could not remember the nurse's name.