Sebastian Baez defeated Dalibor Svrcina in the first round of the Santiago CH ATP Challenger on clay on 4 October 2021. The Argentine progressed past the Slovak opponent to advance further in the tournament. Baez's victory at the Chilean event marked a solid early-round performance on the red surface, where consistency and court positioning typically favour players with strong baseline games. The result contributed to Baez's development trajectory during the 2021 Challenger circuit season.