Kayo spent the last two seasons in the D.C. United academy after playing in the Development Academy for Bethesda-Olney and Bethesda SC. He made three appearances for Loudoun United this summer.
Kayo, a 6-foot-1 midfielder, has had interest from European teams but won't be eligible to sign a pro contract with a foreign club until the 2020 summer transfer window. In the past, other players have opted out of MLS academies and signed with non-MLS U.S. clubs, allowing themselves to get paid before they turn 18 and then sign abroad on favorable terms with their U.S. club. The most notable example is Haji Wright, who signed with the New York Cosmos before moving to Schalke 04. He is now at Dutch club VVV-Venlo.
Kayo isn't the first youth player to sign with Orange County SC. In 2018, OCSC signed Aaron Cervantes, who is expected to be the No. 3 keeper on the 2019 U.S. U-17 World Cup team. It recently signed 14-year-old Francis Jacobs, making him the youngest male player signing in U.S. pro history.
Kayo's signing will leave Kobe Hernandez, who plays for the LA Galaxy academy, as the only projected contributor on the 2019 U.S. U-17 World Cup team who has not turned pro. Hernandez is considered the most talented defender in the U.S. youth system and, like Kayo, won't be eligible to sign a pro contract with a foreign club until the 2020 summer transfer window after he turns 18.
Of the 21 players that took part in Concacaf qualifying, 15 of the 21 U.S. players are now signed to pro contracts, including every midfielder and forward.