Chinese Taipei's first brother Zeng Junxin broke through 4 levels in a row in the 2025 Rio Men's Open, but unfortunately was affected by injuries and lost to Argentine defending champion Baez 4:6, 1:6 local time on the 21st, stopping in the top 8 of ATP 500 men's singles, still tying the best singles record of Chinese Taipei men's players with retired predecessor Lu Yanxun.

Chinese Taipei's first brother Zeng Junxin

This clay tournament was held in Brazil, and Zeng Junxin, ranked 125th in the world men's singles this week, bid farewell to the low tide of four consecutive defeats at the beginning of the season, and broke through all the way from the Rio Dating Tournament, especially in the qualifying rounds, knocked down the 28-ranked Chilean star Tabilo and the host player Monteiro, and reached the top 8 of the ATP 500 tournament for the first time in his career, which boosted the morale of the 23-year-old Chinese Taipei brother, and tied Lu Yanxun, who reached the top 8 of the 2015 China Open.

However, in the face of Baez, the fifth seed who won the championship last year, Zeng Junxin failed to continue the momentum of two consecutive victories in the previous clay match, and fell behind at the beginning of the match, saving four set points to concede the first set. In the second set, Zeng Junxin lost his serve in the second game to form 0:3, and also took a medical timeout due to discomfort in his right thigh, and he struggled to catch up when he returned to the game, and was broken in the sixth game, and was avenged by his opponent in straight sets, but the latest ranking on Monday is expected to return to the top 100 in the world.