A spot in the next round is at stake on Thursday, when Eduardo Ribeiro goes up against Gustavo Heide in the Antofagasta round of 16. Gustavo Heide is 8-2 across recent matches. Eduardo Ribeiro comes in at 4 wins from the last ten.

The serve is where this match separates: Heide has been winning 71.7% of first-serve points to Ribeiro's 64.2%, and on clay that gap compounds fast. Anything other than a Heide win would rank among the bigger surprises of the week.