8 year old Haley Dawson threw out the first pitch at the Blue Jays game against the Boston Red Sox at the Rogers Centre in Toronto, Tuesday August 7, 2018 with her 3D-printed hand.
Hailey - born in the US with Poland Syndrome, received her prosthetic hand from the University of Nevada, Las Vegas about 4 years ago.
Since then she has thrown out the first pitch at 24 out of 30 baseball stadiums. Source.