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Does it refer to the French open trophy (Tournoi de Roland-Garros's)which was named the Coupe des Mousquetaires(The Four muskeeteers) in honour of the quartet referred in the picture?
Court Philippe-Chatrier(Centre Court )at Roland Garros,Paris.The four main spectator grandstands at the Centre Court are named for les Quatre Mousquetaires ("Four Musketeers")of French Tennis.
Both of you are right although VK Handa has given a more apposite answer.....It is the Roland Garros center court which is being referred to and the Les Quatre Mousquetaires (The Four Musketeers) are the 4 French Tennis legends after whom the stands have been named......the question was to commemorate the French Open which concluded today......keep the quizzer alive!!!