Vallejo vs Shang — Paraguay's breakout year against a comeback still finding its feet
Preview · National Bank Open, Montréal (ATP Masters 1000) · First round · 2 August 2026
Two of the youngest men in the draw open against each other. Adolfo Daniel Vallejo is 22 and having the season that changes a career. Shang Juncheng is 21 and rebuilding one that injury interrupted at exactly the wrong moment. Both are in the main draw without playing qualifying, and neither is a wildcard.
The matchup
Vallejo, from Paraguay and born in April 2004, has climbed into the world’s top seventy-five, essentially his career best. The volume is remarkable: well over thirty match wins, built on a South American Challenger sweep that brought titles in Itajaí and Brasília. He translated it upwards, reaching the third round in Madrid on clay by beating Grigor Dimitrov and Learner Tien, and the second round at Roland Garros, where he beat Cameron Norrie and then lost a five-setter to Moez Kouame in a final-set tie-break. In July he reached the semi-finals at Båstad, seeing off Botic van de Zandschulp and Stefano Travaglia before Luciano Darderi ended it.
Shang is a left-hander from China with a career high of 47 who now sits well outside the top 250, the arithmetic of a long absence rather than any decline in ability. His 2026 has been short: a quarter-final in Hong Kong in January, where he beat Federico Comesana and Lorenzo Sonego, a second round at the Australian Open after beating Roberto Bautista Agut, then a thin schedule including first-round draws against Daniil Medvedev in Doha and Dubai. Every match he has played this year has come on hard courts, and he had a main-draw outing in Washington last week.
They have never met.
Form & conditions
The obvious caveat on Vallejo is surface. Almost all of his 2026 has been played on clay, and his hard-court record amounts to a handful of matches. Montréal is fast, the ball stays low, and the patterns that have served him so well — heavy spin, deep positioning, patience — are the ones this surface erodes first. He also carries a heavy workload into August, and his most recent outing was a first-round loss to Kilian Feldbausch in Kitzbühel on clay.
Shang’s problem is the opposite. He knows this surface, and at his best he is a genuinely top-fifty hard-court player with a left-hander’s serve angles and clean, early ball-striking. What he lacks is matches: single-figure wins for the season and no sustained run to build from.
The deciding factor
Adaptation against reacquaintance. Vallejo must shorten his swings and accept that points finish earlier than he would like; play Båstad tennis here and he spends the afternoon defending from a metre behind where he wants to be. Shang has to hold serve consistently enough to make this about his forehand rather than his fitness. The more reliable level over two hours wins, and that likelier belongs to the man winning every week.
The call
The lean is Vallejo, because form and match-sharpness are worth more in a first round than surface familiarity alone, with confidence at low-medium given how little hard-court evidence he has offered this season and how quickly a left-hander finding his range can flip a match like this.
