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Ranked 114th in the world, Aslan Karatsev entered the 2021 Australian Open as a complete unknown. Despite his low ranking, he stunned the tennis world by reaching the semi-finals, becoming the first Russian man in 10 years to reach the final four at a Grand Slam. Karatsev's incredible run included victories over higher-ranked opponents such as Diego Schwartzman and Grigor Dimitrov.