| Jan 26, 2024 | Robert Diaz Villagran | ½–½ | Maximiliano Perez | Round 8: Robert Diaz Villagran - Maximiliano Perez | French Defense: King's Indian Attack | |
| Jan 25, 2024 | Diego Saul Rodri Flores Quillas | ½–½ | Robert Diaz Villagran | Round 7: Diego Saul Rodri Flores Quillas - Robert Diaz Villagran | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jan 24, 2024 | Robert Diaz Villagran | ½–½ | Juliana Sayumi Terao | Round 13: Robert Diaz Villagran - Juliana Sayumi Terao | Sicilian Defense: Delayed Alapin Variation | |
| Jan 24, 2024 | Kaua Marques Silva | 0–1 | Robert Diaz Villagran | Round 12: Kaua Marques Silva - Robert Diaz Villagran | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jan 24, 2024 | Robert Diaz Villagran | 0–1 | Lucas Do Valle Cardoso | Round 11: Robert Diaz Villagran - Lucas Do Valle Cardoso | Four Knights Game: Glek System | |
| Jan 24, 2024 | Luigy Lira De Siqueira | 0–1 | Robert Diaz Villagran | Round 10: Luigy Lira De Siqueira - Robert Diaz Villagran | French Defense: Tarrasch Variation, Guimard Defense, Main Line | |
| Jan 24, 2024 | Robert Diaz Villagran | * | Ivan Excender Soriano Quispe | Round 8: Robert Diaz Villagran - Ivan Excender Soriano Quispe | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jan 24, 2024 | Neuris Delgado Ramirez | 1–0 | Robert Diaz Villagran | Round 7: Neuris Delgado Ramirez - Robert Diaz Villagran | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jan 24, 2024 | Federico Torres | 0–1 | Robert Diaz Villagran | Round 6: Federico Torres - Robert Diaz Villagran | French Defense: King's Indian Attack | |
| Jan 24, 2024 | Robert Diaz Villagran | ½–½ | Pablo Salinas Herrera | Round 5: Robert Diaz Villagran - Pablo Salinas Herrera | Alekhine Defense: Exchange Variation | |
| Jan 24, 2024 | Marcio Jordao Barbosa | 0–1 | Robert Diaz Villagran | Round 4: Marcio Jordao Barbosa - Robert Diaz Villagran | French Defense: Winawer Variation, Advance Variation | |
| Jan 24, 2024 | Robert Diaz Villagran | 1–0 | Ismail Rekik | Round 3: Robert Diaz Villagran - Ismail Rekik | Pirc Defense: Austrian Attack | |
| Jan 24, 2024 | Diego Pinheiro Samaniego | 0–1 | Robert Diaz Villagran | Round 2: Diego Pinheiro Samaniego - Robert Diaz Villagran | English Opening: Anglo-Indian Defense, King's Indian Formation | |
| Jan 24, 2024 | Robert Diaz Villagran | 1–0 | Gualter Amelio De Oliveira | Round 1: Robert Diaz Villagran - Gualter Amelio De Oliveira | Scandinavian Defense: Marshall Variation | |
| Nov 27, 2023 | Kevin Sun | 0–1 | Robert Diaz Villagran | Round 9: Kevin Sun - Robert Diaz Villagran | French Defense: Advance Variation | |
| Nov 26, 2023 | Robert Diaz Villagran | 1–0 | Jashith Karthi | Round 8: Robert Diaz Villagran - Jashith Karthi | Italian Game: Giuoco Piano | |
| Nov 26, 2023 | Roger V Shi | 0–1 | Robert Diaz Villagran | Round 7: Roger V Shi - Robert Diaz Villagran | French Defense: Advance Variation | |
| Nov 25, 2023 | Robert Diaz Villagran | 1–0 | Luke Widjaja | Round 6: Robert Diaz Villagran - Luke Widjaja | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Nov 25, 2023 | Shaaketh Sivakumar | ½–½ | Robert Diaz Villagran | Round 5: Shaaketh Sivakumar - Robert Diaz Villagran | Italian Game: Hungarian Defense | |
| Nov 24, 2023 | Robert Diaz Villagran | 1–0 | Adam B Stevens | Round 4: Robert Diaz Villagran - Adam B Stevens | Sicilian Defense: Modern Variations | |
| Nov 24, 2023 | Shaashwath Sivakumar | ½–½ | Robert Diaz Villagran | Round 3: Shaashwath Sivakumar - Robert Diaz Villagran | Old Indian Defense | |
| Nov 23, 2023 | Patrick Liu | 0–1 | Robert Diaz Villagran | Round 2: Patrick Liu - Robert Diaz Villagran | Rapport-Jobava System | |
| Nov 23, 2023 | Robert Diaz Villagran | ½–½ | Henry Deng | Round 1: Robert Diaz Villagran - Henry Deng | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jul 1, 2023 | Robert Diaz Villagran | 1–0 | Furqan Tanwir | 51st Annual World Open | Sicilian Defense: Alapin Variation | |
| Jun 30, 2023 | Robert Diaz Villagran | ½–½ | Jayden Wu | 51st Annual World Open | Sicilian Defense: Alapin Variation | |
| Jun 28, 2023 | Robert Diaz Villagran | 1–0 | Joshua Altman | 16th Annual Philadelphia International International | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jun 27, 2023 | Robert Diaz Villagran | 1–0 | Ansh Shah | 16th Annual Philadelphia International International | Caro-Kann Defense: Endgame Variation | |
| Jun 27, 2023 | Aditya Arutla | ½–½ | Robert Diaz Villagran | 16th Annual Philadelphia International International | French Defense: Winawer Variation, Advance Variation | |
| Jun 27, 2023 | Yasser Quesada Perez | 1–0 | Robert Diaz Villagran | 16th Annual Philadelphia International International | Italian Game: Classical Variation, Greco Gambit | |
| Jun 25, 2023 | Robert Diaz Villagran | ½–½ | Theodore Slade | 16th Annual Philadelphia International International | Italian Game: Giuoco Pianissimo, Normal | |
| May 31, 2023 | Advay Bansal | ½–½ | Robert Diaz Villagran | Bay Area Memorial Day Scheveningen IM Norm | French Defense: Winawer Variation, Eingorn Variation | |
| May 29, 2023 | Robert Diaz Villagran | ½–½ | Ashritha Eswaran | Round 8: Robert Diaz Villagran - Ashritha Eswaran | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| May 29, 2023 | Andrew Guo | ½–½ | Robert Diaz Villagran | Round 7: Andrew Guo - Robert Diaz Villagran | King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System | |
| May 28, 2023 | Robert Diaz Villagran | 0–1 | Bryan Xie | Round 6: Robert Diaz Villagran - Bryan Xie | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| May 28, 2023 | Patrick Liu | 0–1 | Robert Diaz Villagran | Round 5: Patrick Liu - Robert Diaz Villagran | Old Indian Defense: Ukrainian Variation | |
| May 27, 2023 | Robert Diaz Villagran | ½–½ | Nathan Yan | Round 4: Robert Diaz Villagran - Nathan Yan | Italian Game: Classical Variation, Giuoco Pianissimo | |
| May 27, 2023 | Pranav Sathish | ½–½ | Robert Diaz Villagran | Round 3: Pranav Sathish - Robert Diaz Villagran | Zukertort Opening: Nimzo-Larsen Variation | |
| May 26, 2023 | Robert Diaz Villagran | 1–0 | Milind Maiti | Round 2: Robert Diaz Villagran - Milind Maiti | Petrov's Defense: French Attack | |
| May 26, 2023 | Robert Diaz Villagran | 1–0 | Yu-Cheng Liang | Round 1: Robert Diaz Villagran - Yu-Cheng Liang | Caro-Kann Defense: Endgame Offer | |
