Toronto Blue Jays superstar Edwin Encarnacion has been sued by a woman who claims he knowingly gave her multiple STDs during a romantic weekend ... TMZ Sports has learned. The woman behind the lawsuit claims she's a 24-year-old family friend of the MLB star who first met him in 2013. In her lawsuit, the woman claims she hooked up with one of Edwin's teammates in 2015 -- but was tested in December 2015 at a Planned Parenthood and was told she was clean. The woman claims she later hooked up with Edwin during a trip to Punta Cana in the Dominican Republic in February 2016 ... and had unprotected sex on at least 2 occasions. Problem is ... the woman claims she was in pain in the days after the hookup and thought she had Zika -- so she went to a doctor. She later learned it was NOT Zika -- but rather two STDs. The woman claims she contacted Edwin -- but he insisted he was clean and "suggested she may have picked up [the STDs] when they went 4-wheeling and she swam in the river." - See more at: http://www.tmz.com/2016/08/22/mlb-star-edwin-encarnacion-battery-std-allegations/