Menelaos Efstathiou (; born 2 March 1999) is a Cypriot tennis player. Efstathiou has a career high ATP singles ranking of No. 543 achieved on 21 September 2026 and a career high ATP doubles ranking of No. 464 achieved on 10 November 2025.
Efstathiou has represented Cyprus in the Davis Cup, where he has a W/L record of 5–6.
Juniors Efstathiou reached the quarterfinals of the 2017 Australian Open boys' singles championships.
Efstathiou has a career high ITF junior combined ranking of world No. 42 achieved on 27 March 2017.
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Davis Cup Participations: (5–6)
Group membershipWorld Group (0–0)WG play-off (0–0)Group I (0–0)Group II (0–2)Group III (1–3)Group IV (4–1)Matches by surfaceHard (0–2)Clay (5–4)Grass (0–0)Carpet (0–0)Matches by typeSingles (5–6)Doubles (0–0) indicates the outcome of the Davis Cup match followed by the score, date, place of event, the zonal classification and its phase, and the court surface.
Rubber outcomeNo.RubberMatch type (partner if any)Opponent nationOpponent player(s)Score1–4; 3–5 February 2017; National Tennis Centre, Nicosia, Cyprus; Europe/Africa Zone Group II first round; hard surfaceDefeat1IISingles TurkeyMarsel İlhan7–5, 6–1, 4–6, 6–7(5–7), 4–61–4; 7–9 April 2017; National Tennis Centre, Nicosia, Cyprus; Europe/Africa Zone Group II relegation play-off; hard surfaceDefeat2ISingles TunisiaMalek Jaziri2–6, 3–6, 5–73–0; 4 April 2018; Tennis Club Lokomotiv, Plovdiv, Bulgaria; Europe Zone Group III Pool B round robin; clay surfaceVictory3IISingles AndorraÈric Cervós Noguer6–0, 6–02–1; 5 April 2018; Tennis Club Lokomotiv, Plovdiv, Bulgaria; Europe Zone Group III Pool B round robin; clay surfaceDefeat4IISingles San MarinoMarco De Rossi4–6, 5–71–2; 6 April 2018; Tennis Club Lokomotiv, Plovdiv, Bulgaria; Europe Zone Group III Pool B round robin; clay surfaceDefeat5IISingles MonacoLucas Catarina7–5, 1–6, 2–60–2; 7 April 2018; Tennis Club Lokomotiv, Plovdiv, Bulgaria; Europe Zone Group III 3rd-4th playoff; clay surfaceDefeat6IISingles MacedoniaDimitar Grabul1–6, 7–5, 6–7(5–7)3–0; 15 July 2019; Centro Tennis Cassa di Risparmio, City of San Marino, San Marino; Europe Zone Group IV Pool A round robin; clay surfaceVictory7ISingles IcelandBirkir Gunnarsson6–1, 6–23–0; 16 July 2019; Centro Tennis Cassa di Risparmio, City of San Marino, San Marino; Europe Zone Group IV Pool A round robin; clay surfaceVictory8ISingles ArmeniaArtur Soghoyan6–1, 6–13–0; 18 July 2019; Centro Tennis Cassa di Risparmio, City of San Marino, San Marino; Europe Zone Group IV Pool A round robin; clay surfaceVictory9ISingles AlbaniaMartin Muedini6–0, 6–13–0; 19 July 2019; Centro Tennis Cassa di Risparmio, City of San Marino, San Marino; Europe Zone Group IV Pool A round robin; clay surfaceVictory10ISingles LiechtensteinRobin Forster6–0, 6–12–1; 20 July 2019; Centro Tennis Cassa di Risparmio, City of San Marino, San Marino; Europe Zone Group IV promotional playoff; clay surfaceDefeat11ISingles IrelandSimon Carr3–6, 1–6
Games of the Small States of Europe Doubles 2 (2 victory) OutcomeNo.DateTournamentSurfacePartnerOpponentScoreVictory1.2 June 2017City of San Marino, San MarinoClay Eleftherios Neos Florent Diep Thomas Oger5–7, 6–2, [10–5]Victory2.1 June 2019Budva, MontenegroClay Eleftherios Neos Lucas Catarina Romain Arneodo6–1, 7–5
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