| Dec 2, 2023 | Osvaldo Zambrana | 1–0 | Sandro Mareco | Round 9: Osvaldo Zambrana - Sandro Mareco | Italian Game: Giuoco Piano | |
| Dec 1, 2023 | Sandro Mareco | ½–½ | Jose Fernando Cuenca Jimenez | Round 8: Sandro Mareco - Jose Fernando Cuenca Jimenez | Queen's Gambit Declined: Charousek Variation | |
| Nov 30, 2023 | Andres Rodriguez Vila | 0–1 | Sandro Mareco | Round 7: Andres Rodriguez Vila - Sandro Mareco | King's Indian Attack: Sicilian Variation | |
| Nov 29, 2023 | Sandro Mareco | ½–½ | Oscar De La Riva Aguado | Round 6: Sandro Mareco - Oscar De La Riva Aguado | French Defense: Classical Variation, Steinitz Variation | |
| Nov 29, 2023 | Cristobal Henriquez Villagra | ½–½ | Sandro Mareco | Round 5: Cristobal Henriquez Villagra - Sandro Mareco | French Defense: Tarrasch Variation, Open System, Main Line | |
| Nov 28, 2023 | Ermes Espinosa Veloz | ½–½ | Sandro Mareco | Round 4: Ermes Espinosa Veloz - Sandro Mareco | Sicilian Defense: Delayed Alapin Variation, with d6 | |
| Nov 26, 2023 | Sandro Mareco | 1–0 | Sergio Duran Vega | Round 3: Sandro Mareco - Sergio Duran Vega | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld Gambit | |
| Nov 26, 2023 | Jorge Luis Baules Rodriguez | * | Sandro Mareco | Round 2: Jorge Luis Baules Rodriguez - Sandro Mareco | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Nov 25, 2023 | Sandro Mareco | 1–0 | Maria Florencia Fernandez | Round 1: Sandro Mareco - Maria Florencia Fernandez | Catalan Opening: Open Defense, Classical Line | |
| Oct 15, 2023 | Jose Eduardo Martinez Alcantara | ½–½ | Sandro Mareco | Round 9: Jose Eduardo Martinez Alcantara - Sandro Mareco | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Oct 15, 2023 | Sandro Mareco | 1–0 | Carlos Daniel Albornoz Cabrera | Round 8: Sandro Mareco - Carlos Daniel Albornoz Cabrera | Indian Defense: Anti-Nimzo-Indian | |
| Oct 14, 2023 | Juan Carlos Gonzalez Zamora | ½–½ | Sandro Mareco | Round 7: Juan Carlos Gonzalez Zamora - Sandro Mareco | Bogo-Indian Defense: Retreat Variation | |
| Oct 14, 2023 | Sandro Mareco | 1–0 | Julio Cesar Diaz Rosas | Round 6: Sandro Mareco - Julio Cesar Diaz Rosas | English Opening: Anglo-Indian Defense, Hedgehog System | |
| Oct 13, 2023 | Dylan Isidro Berdayes Ason | ½–½ | Sandro Mareco | Round 5: Dylan Isidro Berdayes Ason - Sandro Mareco | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Oct 13, 2023 | Sandro Mareco | ½–½ | Sion Radamantys Galaviz Medina | Round 4: Sandro Mareco - Sion Radamantys Galaviz Medina | Sicilian Defense: Najdorf Variation, English Attack | |
| Oct 13, 2023 | Sandro Mareco | * | Sion Radamantys Galaviz Medina | Round 4: Sandro Mareco - Sion Radamantys Galaviz Medina | Sicilian Defense: Najdorf Variation, English Attack | |
| Oct 13, 2023 | Amanda Maria Muniz Guevara | ½–½ | Sandro Mareco | Round 1: Amanda Maria Muniz Guevara - Sandro Mareco | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Oct 13, 2023 | Sandro Mareco | 1–0 | Alexander Andres Hernandez Jimenez | Round 2: Sandro Mareco - Alexander Andres Hernandez Jimenez | Réti Opening | |
| Oct 13, 2023 | Carlos Sandoval Mercado | 0–1 | Sandro Mareco | Round 3: Carlos Sandoval Mercado - Sandro Mareco | Nimzo-Indian Defense: Normal Variation, Classical Defense | |
| May 23, 2023 | Sandro Mareco | ½–½ | Elier Miranda Mesa | Round 11: Sandro Mareco - Elier Miranda Mesa | Caro-Kann Defense: Advance Variation, Short Variation | |
| May 22, 2023 | Joshua Johnson | ½–½ | Sandro Mareco | Round 10: Joshua Johnson - Sandro Mareco | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| May 21, 2023 | Sandro Mareco | 1–0 | Matias Latorre | Round 9: Sandro Mareco - Matias Latorre | English Opening: Agincourt Defense | |
| May 21, 2023 | Osvaldo Zambrana | 1–0 | Sandro Mareco | Round 8: Osvaldo Zambrana - Sandro Mareco | Italian Game: Giuoco Pianissimo, Normal | |
| May 20, 2023 | Sandro Mareco | ½–½ | Fidel Corrales Jimenez | Round 7: Sandro Mareco - Fidel Corrales Jimenez | King's Indian Defense: Normal Variation, King's Knight Variation | |
| May 19, 2023 | Josiah Stearman | ½–½ | Sandro Mareco | Round 6: Josiah Stearman - Sandro Mareco | Sicilian Defense: Najdorf Variation | |
| May 18, 2023 | Sandro Mareco | ½–½ | Brian Sebasti Escalante Ramirez | Round 5: Sandro Mareco - Brian Sebasti Escalante Ramirez | Indian Defense: Dzindzi-Indian Defense | |
| May 17, 2023 | Maximillian Lu | * | Sandro Mareco | Round 4: Maximillian Lu - Sandro Mareco | Three Knights Opening | |
| May 16, 2023 | Sandro Mareco | 1–0 | Carlos Paul Abreu Jean | Round 3: Sandro Mareco - Carlos Paul Abreu Jean | Sicilian Defense: Najdorf Variation, English Attack | |
| May 16, 2023 | Josue Araujo Sanchez | ½–½ | Sandro Mareco | Round 2: Josue Araujo Sanchez - Sandro Mareco | English Opening: King's English Variation, Two Knights Variation, Smyslov System | |
| May 15, 2023 | Sandro Mareco | 1–0 | Eduardo Galvez Dastin | Round 1: Sandro Mareco - Eduardo Galvez Dastin | Semi-Slav Defense: Stoltz Variation | |
| Apr 9, 2023 | Luis Ernesto Quesada Perez | ½–½ | Sandro Mareco | Round 8: Rodney Oscar Perez Garcia - Jose Eduardo Martinez Alcantara | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Apr 9, 2023 | Sandro Mareco | 1–0 | Abel Fabian Lopez Gonzalez | Round 9: Sandro Mareco - Abel Fabian Lopez Gonzalez | Queen's Gambit Accepted: Classical Defense, Alekhine System | |
| Apr 8, 2023 | Sandro Mareco | ½–½ | Cristobal Henriquez Villagra | Round 7: Sandro Mareco - Cristobal Henriquez Villagra | Semi-Slav Defense | |
| Apr 7, 2023 | Jose Eduardo Martinez Alcantara | ½–½ | Sandro Mareco | Round 6: Jose Eduardo Martinez Alcantara - Sandro Mareco | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Apr 7, 2023 | Sandro Mareco | 1–0 | Guillermo Javier Ruiz Gonzalez | Round 1: Sandro Mareco - Guillermo Javier Ruiz Gonzalez | Réti Opening: Advance Variation | |
| Apr 7, 2023 | Sandro Mareco | 1–0 | Vyom Vidyarthi | Round 5: Sandro Mareco - Vyom Vidyarthi | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| Apr 7, 2023 | Yusuan A. Gutierrez Delgado | 0–1 | Sandro Mareco | Round 4: Yusuan A. Gutierrez Delgado - Sandro Mareco | Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation | |
| Apr 6, 2023 | Sandro Mareco | 1–0 | Sion Radamantys Galaviz Medina | Round 3: Sandro Mareco - Sion Radamantys Galaviz Medina | Queen's Gambit Declined: Three Knights, Vienna Variation | |
| Apr 6, 2023 | Cristobal Henriquez Villagra | 0–1 | Sandro Mareco | Round 2: Cristobal Henriquez Villagra - Sandro Mareco | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jan 29, 2023 | Sandro Mareco | 1–0 | Juan Sebastian Melian | Round 10: Sandro Mareco - Juan Sebastian Melian | Sicilian Defense: Kan Variation, Wing Attack | |
| Jan 28, 2023 | Juliana Sayumi Terao | 0–1 | Sandro Mareco | Round 9: Juliana Sayumi Terao - Sandro Mareco | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jan 27, 2023 | Sandro Mareco | ½–½ | Evandro Amorim Barbosa | Round 8: Sandro Mareco - Evandro Amorim Barbosa | Sicilian Defense: Sozin Attack, Main Line | |
| Jan 27, 2023 | Diego Rafael Di Berardino | ½–½ | Sandro Mareco | Round 7: Diego Rafael Di Berardino - Sandro Mareco | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Jan 26, 2023 | Sandro Mareco | 1–0 | Matheus Mendes Domingues Ribeiro | Round 6: Sandro Mareco - Matheus Mendes Domingues Ribeiro | Catalan Opening: Open Defense, Classical Line | |
| Jan 26, 2023 | Edgar Rodrigues | ½–½ | Sandro Mareco | Round 5: Edgar Rodrigues - Sandro Mareco | Scotch Game: Classical Variation | |
| Jan 25, 2023 | Sandro Mareco | 1–0 | Yago Labussiere | Round 4: Sandro Mareco - Yago Labussiere | King's Indian Attack | |
| Jan 24, 2023 | Vitor Augusto Ponciano De Carvalho | 0–1 | Sandro Mareco | Round 3: Vitor Augusto Ponciano De Carvalho - Sandro Mareco | Sicilian Defense: Old Sicilian | |
| Jan 24, 2023 | Sandro Mareco | 1–0 | Renan Barbosa Monteiro Soares | Round 2: Sandro Mareco - Renan Barbosa Monteiro Soares | King's Indian Defense: Orthodox Variation | |
| Jan 23, 2023 | Edgardo Campora | 0–1 | Sandro Mareco | Round 1: Edgardo Campora - Sandro Mareco | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Oct 23, 2022 | Sandro Mareco | 1–0 | Salvador Alonso | Round 9: Sandro Mareco - Salvador Alonso | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Oct 23, 2022 | Fabian Fiorito | * | Sandro Mareco | Round 8: Fabian Fiorito - Sandro Mareco | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Nyezhmetdinov Attack | |
| Oct 23, 2022 | Sandro Mareco | ½–½ | Fernando Bertona | Round 7: Sandro Mareco - Fernando Bertona | Queen's Gambit Declined | |
| Oct 23, 2022 | Pablo Zarnicki | 0–1 | Sandro Mareco | Round 6: Pablo Zarnicki - Sandro Mareco | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld Gambit | |
| Oct 23, 2022 | Sandro Mareco | ½–½ | Alan Pichot | Round 5: Sandro Mareco - Alan Pichot | Catalan Opening: Open Defense, Classical Line | |
| Oct 22, 2022 | Sandro Mareco | 1–0 | Robert Hungaski | Round 4: Sandro Mareco - Robert Hungaski | Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch | |
| Oct 22, 2022 | Daniel Perez | 0–1 | Sandro Mareco | Round 3: Daniel Perez - Sandro Mareco | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld Gambit | |
| Oct 22, 2022 | Sandro Mareco | 1–0 | Leon Piasetski | Round 2: Sandro Mareco - Leon Piasetski | Zukertort Opening: Queenside Fianchetto Variation | |
| Oct 22, 2022 | Ariel Mosconi | 0–1 | Sandro Mareco | Round 1: Ariel Mosconi - Sandro Mareco | Hungarian Opening | |
| Sep 18, 2022 | Sandro Mareco | 1–0 | Tobias Sebastian Moreno Perez | Round 9: Sandro Mareco - Tobias Sebastian Moreno Perez | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Sep 18, 2022 | Daniel Perez | ½–½ | Sandro Mareco | Round 8: Daniel Perez - Sandro Mareco | Scotch Game: Schmidt Variation | |
| Sep 18, 2022 | Sandro Mareco | 0–1 | Diego Flores | Round 7: Diego Flores - Sandro Mareco | Bogo-Indian Defense: Grünfeld Variation | |
| Sep 18, 2022 | David Lariño Nieto | 0–1 | Sandro Mareco | Round 6: David Lariño Nieto - Sandro Mareco | Nimzo-Larsen Attack: Classical Variation | |
| Sep 18, 2022 | Sandro Mareco | ½–½ | Juan Manuel Gaitan | Round 5: Sandro Mareco - Juan Manuel Gaitan | English Opening: Neo-Catalan | |
| Sep 17, 2022 | Jose Cejas | 0–1 | Sandro Mareco | Round 4: Jose Cejas - Sandro Mareco | Italian Game: Evans Gambit, Anderssen Variation, Cordel Line | |
| Sep 17, 2022 | Sandro Mareco | 1–0 | Maria Florencia Fernandez | Round 3: Sandro Mareco - Maria Florencia Fernandez | Sicilian Defense: Dragon Variation, Yugoslav Attack, Modern Line | |
| Sep 17, 2022 | Raul Chiappero | 0–1 | Sandro Mareco | Round 2: Raul Chiappero - Sandro Mareco | Indian Defense | |
| Sep 17, 2022 | Sandro Mareco | 1–0 | Carlos Zavaleta | Round 1: Sandro Mareco - Carlos Zavaleta | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Feb 19, 2022 | Sandro Mareco | 1–0 | Omar Almeida Quintana | Round 9: Sandro Mareco - Omar Almeida Quintana | Philidor Defense: Lion Variation | |
| Feb 19, 2022 | Sandro Mareco | ½–½ | Jaime Santos Latasa | Round 7: Sandro Mareco - Jaime Santos Latasa | Queen's Pawn Game: London System | |
| Feb 19, 2022 | Guillermo Vazquez | ½–½ | Sandro Mareco | Round 8: Guillermo Vazquez - Sandro Mareco | Italian Game: Giuoco Piano | |
| Feb 17, 2022 | Jose Fernando Cuenca Jimenez | 0–1 | Sandro Mareco | Round 6: Jose Fernando Cuenca Jimenez - Sandro Mareco | Queen's Gambit Declined: Ragozin Defense | |
| Feb 17, 2022 | Emilio Cordova | 0–1 | Sandro Mareco | Round 5: Emilio Cordova - Sandro Mareco | Zukertort Opening: Quiet System | |
| Feb 17, 2022 | Sandro Mareco | 1–0 | Guilherme B Lima Santos Jose | Round 4: Sandro Mareco - Guilherme B Lima Santos Jose | Catalan Opening: Open Defense, Classical Line | |
| Feb 17, 2022 | Sandro Mareco | 1–0 | Kenneth Frey Beckman | Round 3: Sandro Mareco - Kenneth Frey Beckman | Queen's Gambit Declined: Charousek Variation | |
| Feb 17, 2022 | Carlos Sandoval Mercado | ½–½ | Sandro Mareco | Round 2: Carlos Sandoval Mercado - Sandro Mareco | Catalan Opening: Open Defense, Classical Line | |
| Feb 17, 2022 | Sandro Mareco | 1–0 | Alejandra Guerrero Rodriguez | Round 1: Sandro Mareco - Alejandra Guerrero Rodriguez | Bogo-Indian Defense: Grünfeld Variation | |