The men's 100 metre backstroke competition at the 2018 Mediterranean Games was held on 24 June 2018 at the Campclar Aquatic Center.

Records Prior to this competition, the existing world and Mediterranean Games records were as follows: World record51.85Rio de Janeiro, Brazil13 August 2016Mediterranean Games record52.38Pescara, Italy1 July 2009

Results Heats The heats were held at 10:18. RankHeatLaneNameNationalityTimeNotes124Simone Sabbioni54.72Q217Christopher Ciccarese54.75Q315Youssef Said55.74Q433Gabriel José Lopes55.79Q523Jorge Martín56.26Q634Apostolos Christou56.64Q735Nikolaos Sofianidis56.80Q836Anton Lončar56.97Q932Anže Ferš Eržen57.071016Ege Başer57.321125Juan Segura57.371226Francisco Santos57.431313Geoffroy Mathieu57.541427Driss Lahrichi57.771512Filippos Iakovidis57.981622Ryad Bouhamidi58.511737Tryfonas Hadjichristoforou58.67

Final The final was held at 18:32. RankLaneNameNationalityTimeNotes7Apostolos Christou54.684Simone Sabbioni54.775Christopher Ciccarese54.7741Nikolaos Sofianidis55.2356Gabriel José Lopes55.7762Jorge Martín55.8878Anton Lončar56.2283Youssef Said56.48

References