Option 1: Novak Djokovic - Novak Djokovic is the correct answer. He is the winner of the French Open 2021 Men`s Singles Final. Djokovic is a professional tennis player from Serbia and is currently ranked number one in the world. He has won numerous Grand Slam titles, including multiple French Open titles. In the 2021 French Open, Djokovic showed exceptional performance and determination, defeating his opponents to reach the finals. In the final match, he faced Stefanos Tsitsipas and emerged as the winner, securing his second French Open title. Djokovic`s victory in the French Open further cemented his status as one of the greatest tennis players of all time.

Option 2: Rafael Nadal - Rafael Nadal is a highly accomplished tennis player, known for his exceptional clay court skills. While Nadal has a remarkable record at the French Open, winning it a record 13 times, he did not win the French Open Men`s Singles Final in 2021. Therefore, option 2 is incorrect.

Option 3: Stefanos Tsitsipas - Stefanos Tsitsipas is a talented tennis player from Greece. He performed exceptionally well in the French Open 2021 and reached the final