Considered one of the top rookies available during the 2017-2018 international signing period, the Mets and Dominican shortstop Ronny Mauricio agreed to a $2.1 million signing bonus for inking a deal with the organization, making his bonus the highest ever doled out by the team (a record that they would break the following year, when catcher Francisco Alvarez was signed for $2.7 million). He made his professional debut in 2018, suiting up for the GCL Mets and hitting .279/.307/.421 in 49 games. At the end of the season, he got a brief promotion to the Kingsport Mets, appearing in 8 games and going 7-30 with 3 walks, 9 strikeouts, and a stolen base.