Name the Indian tennis playerwho has won the men's singles title at the ATP Challenger Tournament.

Indian tennis player Sumit Nagal has won the men's singles title at the ATP Challenger Tournament held in Buenos Aires, Argentina. He defeated Argentina's Facundo Bognis by 6-4, 6-2 to win the title. It was Sumit's second Challenger title of his career, following the triumph in the Bengaluru Challenger event in 2017. He jumped of 26 spots to achieve a career-best ranking of 135.