Baez, ranked No 31, will play the winner of the match between Argentinian lucky loser Camilo Ugo Carabelli and Portuguese lucky loser Jaime Faria next.
The Argentinian won against lucky loser Roman Andres Burruchaga (6-3, 7-5) and Mariano Navone (6-4, 1-6, 6-3) ahead of his victory.
Earlier in the tournament, Tseng, ranked No 125, beat Chilean Alejandro Tabilo, the No 3 seed (6-2, 7-5) and edged out Brazilian wildcard Thiago Monteiro (6-7 (4), 6-3, 7-6 (4)).
Rio de Janeiro ATP 500, other last 8 results (Jockey Club Brasileiro, clay, USD 2.396.115, most recent results first):
Felix Auger Aliassime, of Canada, returns to Jack Draper, of the United Kingdom, during the Cincinnati Open at the Lindner Family Tennis Center in Mason on Frid
Like Rio de Janeiro last week, the ATP Santiago semifinal line-up consists of three Argentinians and one European. Sebastian Baez faces Camilo Ugo Carabelli
Former World No. 1 Angelique Kerber will assume a different role in 2025. The German was announced as the sporting director of the Bad Homburg Open
Stefanos Tsitsipas dedicated his Dubai Tennis Championships semifinal clash against Tallon Griekspoor to the victims of the tragic train crash that