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Thomas Muster
Thomas Muster (born 2 October 1967) is an Austrian former world No. 1 tennis player. One of the world's leading clay court players in the 1990s, he won the 1995 French Open and at his peak was called "The King of Clay". In addition, he won eight Masters 1000 Series titles. Muster is one of the nine players to win Super 9/ATP Masters Series/ATP World Tour Masters 1000 titles on clay, hardcourt and carpet.
With his 1995 French Open title, Muster became the first Austrian to win a Grand Slam singles title, followed by Dominic Thiem at the 2020 US Open.
Source: Wikipedia