| Karthikeyan, Harishkumar1965 | 0-1 | Abdurakhmonov, Mukhammadali2339 | Cornerstone NY Swiss 2026 | 2026 |
| Iinuma, P2034 | ½-½ | Karthikeyan, Harishkumar1965 | Cornerstone NY Swiss 2026 | 2026 |
| Vidyarthi, Omya2180 | 0-1 | Karthikeyan, Harishkumar1965 | Cornerstone NY Swiss 2026 | 2026 |
| Karthikeyan, Harishkumar1965 | ½-½ | Petrov, Vl52335 | Cornerstone NY Swiss 2026 | 2026 |
| Shafer, Logan C2206 | 1-0 | Karthikeyan, Harishkumar1939 | 35th North American Open | 2025 |
| Karthikeyan, Harishkumar1948 | ½-½ | Harish, Neeraj2107 | 19th SPICE Cup Open 2025 | 2025 |
| Karthikeyan, Harishkumar1948 | 0-1 | Darvekar, Yash2018 | 19th SPICE Cup Open 2025 | 2025 |
| Palathingal, Rafael1984 | ½-½ | Karthikeyan, Harishkumar1948 | 19th SPICE Cup Open 2025 | 2025 |
| Vemparala, Nikash2193 | 1-0 | Karthikeyan, Harishkumar1948 | 19th SPICE Cup Open 2025 | 2025 |
| Karthikeyan, Harishkumar1948 | 1-0 | Pisan, Kai2003 | 19th SPICE Cup Open 2025 | 2025 |
| Gottumukkala, Ananth2046 | 1-0 | Karthikeyan, Harishkumar1948 | 19th SPICE Cup Open 2025 | 2025 |
| Karthikeyan, Harishkumar1948 | 0-1 | Lee, Megan2214 | 19th SPICE Cup Open 2025 | 2025 |
| Belenkaya, D2238 | 1-0 | Karthikeyan, Harishkumar1891 | National Open 2025 | 2025 |