Which tournament was held at Roland Garros from 1941 to 1945 but is not recognized by the FFT?

The tournament held at Roland Garros from 1941 to 1945 but not recognized by the FFT was the Tournoi de France.

During World War II, the regular French Championships were officially treated as cancelled for the years 1941 through 1945. Nevertheless, a wartime competition was staged at Roland Garros, then in German-occupied Paris, with restricted participation. It was later called the Tournoi de France, or French Championship of the occupied zone.

The events were real tournaments, but the Fédération Française de Tennis does not include their results in the official French Open record. That is why the period is absent from standard lists of French Open champions, even though players such as Bernard Destremau and Yvon Petra won the men's singles titles during those years.

A common mix-up is to treat these editions as ordinary French Opens. The modern tournament resumed its official lineage in 1946, after the war, rather than counting the wartime editions as part of the championship history.