Police said the case was closed because of a lack of evidence.
Santana read a statement addressing the situation before Wednesday's game at Citi Field, but declined to answer any questions.
"I will make a statement and hopefully, I will make myself clear," Santana said. "I'm aware of this situation. What I can tell you is that police had investigated these claims last year and I was never charged with anything and the case is closed. Unfortunately, at this time, that is all I can say. I have no further comments."
TMZ.com posted a police report filed with the Lee County Sheriff's Office on Oct. 28, the day after the incident on a Florida golf course.
"There was not enough evidence to prove lack of consent, the alleged victim's statement is not consistent with other witnesses," the Sheriff's Office said, according to TMZ.com.
The Mets released a statement that read: "We're aware of the situation. It's a personal matter."