Hyeon Chung scored the biggest win of his career on Thursday by ousting Munich's top seed Gael Monfils. The 20-year-old got his first Top-20 victory in straight-forward fashion, 6-2, 6-4, propelling himself into the quarterfinals.

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The world No. 78 is on a roll after reaching the quarterfinals in Barcelona last week. There he ousted fellow Next Gen star Alexander Zverev before falling to eventual champion Rafael Nadal.

Since Chung is relatively unknown, here are some fast facts to get you caught up to speed:

Age: 20

Birthplace: Suwon, South Korea

Height: 6'1"

Turned pro: 2014

Career highlights: Won his eighth ATP Challenger title in Maui earlier this year

Career-high ranking: No. 51

Before his run in Barcelona, Chung had not made it past the second round of an ATP event since Houston in 2016.