The great rivalries
Head-to-head records count every World Championship both athletes entered. The table lists the championships where at least one of them reached the final.
The Lake and the Harbour: Hendrika “Hennie” Valkhof v Lucien Morand
The sport's first rivalry. Morand beat Valkhof in the very first final in 1931; she beat him in every final they met in after that.
| Championship | Hendrika “Hennie” Valkhof | Lucien Morand |
|---|---|---|
| 1931 Unified | 2 | 1 |
| 1933 Unified | 1 | 3 |
| 1935 Unified | 1 | 2 |
| 1937 Unified | 1 | 6 |
Helsinki: Ottavio Marzanello v Sven-Olof Rydqvist
Rydqvist won the first two post-war titles with Marzanello second in 1949. Then came Helsinki in 1951, the re-swum final, and three Marzanello titles in a row.
| Championship | Ottavio Marzanello | Sven-Olof Rydqvist |
|---|---|---|
| 1947 Unified | 2 | 1 |
| 1949 Unified | 2 | 1 |
| 1951 Unified | 1 | 2 |
| 1953 Unified | 1 | 2 |
Hamburg v Ålesund: Lieselotte Achterberg v Lars-Erik Hovland
Achterberg won four straight Indoor titles with Hovland chasing her. In 1987 he finally beat her to the title.
| Championship | Lieselotte Achterberg | Lars-Erik Hovland |
|---|---|---|
| 1984 Indoor | 1 | 2 |
| 1985 Indoor | 1 | 2 |
| 1986 Indoor | 1 | 2 |
| 1987 Indoor | 2 | 1 |
| 1988 Indoor | 4 | 2 |
| 1989 Indoor | 2 | 4 |
The Torch: Kaori Ishizuchi v Lars-Erik Hovland
The 1991 Indoor final: the only athlete to win both titles against the woman who would win six in a row. Ishizuchi won, and the Indoor era changed hands.
| Championship | Kaori Ishizuchi | Lars-Erik Hovland |
|---|---|---|
| 1988 Indoor | 3 | 2 |
| 1989 Indoor | 3 | 4 |
| 1990 Indoor | 2 | 3 |
| 1991 Indoor | 1 | 2 |
| 1992 Indoor | 1 | 2 |
Osaka: Kaori Ishizuchi v Rutger Blauwhoed
Only one final mattered: 1994, when Blauwhoed won on the scoreboard and lost on review.
| Championship | Kaori Ishizuchi | Rutger Blauwhoed |
|---|---|---|
| 1989 Indoor | 3 | 13 |
| 1990 Indoor | 2 | 4 |
| 1991 Indoor | 1 | 5 |
| 1992 Indoor | 1 | 4 |
| 1993 Indoor | 1 | 3 |
| 1994 Indoor | 1 | DSQ |
Rotterdam: Aaron Warburton v Mathis Delacroix-Brun
Delacroix-Brun won the 2025 title with Warburton fourth. Twelve months later Warburton beat him in the final. The Indoor rivalry of the moment.
| Championship | Aaron Warburton | Mathis Delacroix-Brun |
|---|---|---|
| 2024 Indoor | 3 | 2 |
| 2025 Indoor | 4 | 1 |
| 2026 Indoor | 1 | 2 |
Cagliari: Jonathon Couriard v Joon-ho Baekwol
Baekwol won in 2025 with Couriard taking bronze; in 2026 Couriard beat him in the final. The Outdoor rivalry of the moment.
| Championship | Jonathon Couriard | Joon-ho Baekwol |
|---|---|---|
| 2024 Outdoor | 4 | 2 |
| 2025 Outdoor | 3 | 1 |
| 2026 Outdoor | 1 | 2 |