Peruvian tennis player Ignacio Buse and his Paraguayan partner Adolfo Daniel Vallejo upset the sixth-seeded pair of Guido Andreozzi and Manuel Guinard 6-3, 6-7(7), 10-7 in the round of 32 at the Rolex Shanghai Masters on Friday, October 9, 2026. The victory marks Buse and Vallejo’s first classification to the round of 16 of a Masters 1000 as a pair, coming in a hard-fought encounter that lasted one hour and 44 minutes on the hard courts of Shanghai, China.
An Unlikely Partnership Overcomes Top-Tier Opponents
The South American duo gained entry into the main draw as alternates following a late withdrawal from the tournament’s initial list. Despite having only two previous matches together—both resulting in first-round exits at the 2023 Challenger events in Lima and Montevideo—Buse and Vallejo managed to overcome formidable opposition. Their opponents, Argentina’s Guido Andreozzi and France’s Manuel Guinard, entered the match as the sixth-seeded pair and among the top eight duplas of the season, having reached the semifinals at the Madrid Masters earlier in the year. While Andreozzi and Guinard hold respective ATP doubles rankings of 16th and 15th, Buse and Vallejo relied on resilience, claiming the opening set before securing the match tie-break 10-7 after dropping a tight second-set tiebreak. Before Shanghai, Buse’s last victory in doubles within an ATP tournament was alongside Spanish player Iñigo Cervantes at the ATP 250 in Gstaad, where they defeated Hendrik Jebens and Matej Vocel.
Managing Concurrent Singles Campaigns in Asia
Both athletes arrived in Shanghai following demanding schedules on the Asian tour. Buse entered the tournament looking to bounce back from a first-round exit at the ATP 500 de Beijing against France’s Quentin Halys. In the singles draw at Shanghai, Buse received a bye as the 32nd seed and awaits the winner of the match between the Czech Republic’s Vit Kopriva and Belgium’s Zizou Bergs. If both players fulfill their initial projections, Buse could face Spain’s Carlos Alcaraz in the third round. Meanwhile, Vallejo opened his singles campaign against France’s Valentin Royer, with the victor advancing to face 15th seed Tommy Paul of the United States. Less than a month ago, Adolfo Daniel Vallejo and Ignacio Buse faced each other in the Davis Cup.
Upcoming Round of 16 Matchups in Shanghai
Following their opening-round upset, Buse and Vallejo advance to the round of 16 in the Shanghai Masters doubles bracket. Their next opponents will be determined by the outcome of the match between the Argentine pairing of Francisco Cerúndolo (20th) and Thiago Tirante (54th) or the German duo consisting of Jakob Schnaitter and Mark Wallner.
