Pennsylvania State Police say MLB pitcher Felipe Vazquez suspected the victim in his child solicitation case was underage when he first met her ... but he had sex with her anyway.
TMZ Sports has obtained the police criminal complaint filed by the Penn. State Police in which troopers detail an interview with Vazquez on the morning of Sept. 17, the day he was arrested.
When speaking with cops, the Pittsburgh Pirates pitcher says he initially refused to communicate with the girl "due to her age" ... noting, "she appeared to be 16 years of age or younger."
In the documents, cops say the girl told investigators they began communicating over social media in 2017 when she was only 13 years old.
She claims Vazquez escalated the situation by driving to her Pennsylvania home in August 2017 with the intention of having sex with her.
The girl claims Vazquez invited her into his red Mustang and then began to make sexual moves on her ... at one point trying to have vaginal sex.
Both the girl and Vazquez acknowledge he penetrated her with his penis but they stopped almost immediately -- and he left claiming he had to get ready for a game that night.
When Vazquez spoke with cops, he told investigators that the girl initiated the sexual contact that day.
Cops say in July 2019, Vazquez sent her a text message, sexual in nature, expressing a desire to finish what they started.
Vazquez was arrested on Tuesday and he's facing multiple felonies in 2 states including felony statutory sexual assault, felony unlawful contact with a minor and felony solicitation of a child.
He's currently in custody.