Selected by the Baltimore Orioles in the fourth round (No. 103 overall) of the 2020 MLB Draft out of Stoneman Douglas High School in Parkland, Florida... signed with the Orioles on July 7, 2020 and received a $1.75 million signing bonus... signed with the Orioles after previously committing to the University of Florida... slot value for his selection was $565,600 in 2020... batted .389 in 220 career plate appearances with 63 hits, 50 RBIs and 13 home runs at Stoneman Douglas over parts of four seasons before the 2020 season was cut short due to the Covid-19 pandemic... was a sophomore when he survived the Feb. 14, 2018 mass shooting that killed 17 people at Stoneman Douglas High School. “I play for those [people] because they can’t play. They don’t have voices, they couldn’t live what they wanted to do — and I can," Mayo said in a media conference call in 2020... Mayo became the second Stoneman Douglas player to be drafted since the shooting after Rangers’ 2019 24th-rounder Luke Schiltz... was ranked No. 67 in the 2020 MLB Draft class by FanGraphs and No. 79 by Baseball America... ranked No. 14 by MLB.com among Orioles prospects when he began his Minor League career in June 2021.