Hailey Dawson (born March 2, 2010) is an American girl who is the first person to throw out the ceremonial first pitch in all 30 Major League Baseball stadiums.

[5] The University of Nevada, Las Vegas, College of Engineering built a robotic hand for Dawson in response to a request from her mother, Yong.

[7] She found open-source designs for a 3D-printed prosthesis posted online by a South African organization called RoboHand, and asked the UNLV College of Engineering to produce one for her daughter.

[6] She then expressed a desire to throw out the first pitch at a Baltimore Orioles game, as her father, a Maryland native, had made the team a family favorite.

[9] Dawson next posted a request on Instagram to meet Bryce Harper, a fellow Las Vegas native, and in June 2017 threw out the first pitch to him at Nationals Park.

[10] Major League Baseball also invited her to throw out the first pitch at Game 4 of the 2017 World Series at Minute Maid Park in Houston, Texas.

[6] Dawson began her "Journey to 30" quest to pitch in the remaining 27 stadiums during the 2018 Major League Baseball season with an appearance at Petco Park, home of the San Diego Padres, in late March.

[6] For each stadium Dawson pitched at, the UNLV College of Engineering produced a 3D-printed robotic hand customized with the home team's logo and colors.

[8][13] After reaching her goal of throwing out the first pitch in all 30 MLB stadiums, Dawson donated her Baltimore Orioles-themed robotic hand, which was signed by 13 members of the team and staff, to the National Baseball Hall of Fame and Museum.

[18] In 2016 Dawson wore a 3D-printed robotic hand inscribed with the seal of the president of the United States when she toured the White House and met then-President Barack Obama.