"That's our aim and I'm confident we can compete with the footballers we have," he added, despite the refusal of several clubs to release their players for national duties.
Gaston is to challenge third seed Dominic Thiem in the fourth round. Earlier in the day, the Austrian had claimed another straight-sets victory over 28th seed Casper Ruud, beating the Norwegian 6-4, 6-3, 6-1.
"But I take it as a very positive thing. I am playing quite well to win against a player like Stefano today with this score.
After the second round, Shanghai overtook Wuhan to lead the championship group on four points.
Real Madrid faces a tricky visit to play Levante on Sunday evening and there is a feeling that coach Zinedine Zidane still doesn't know what his strongest eleven is. The Frenchman is handicapped by the loss of Eden Hazard, but in attack Zidane has steered away from playing Karim Benzema and Luka Jovic together to using Vinicius Jr and Rodrygo as wingers behind a lone forward.
Djokovic grabbed five of his 14 break points to claim the victory in two hours and 23 minutes, while his Russian rival only took advantage of two of his nine opportunities.
The host squandered a promising chance after Axel Witsel failed to make the most out of Reyna's cutback pass into the penalty area.
Following is the Uruguay squad:
The fixture between Genoa and Torino was postponed as many of Genoa's players tested positive for COVID-19. Enditem
In women's actions, top seed Simona Halep took sweet revenge on her opponent from last year's French Open defeat, trouncing American teenager Amanda Anisimova 6-0, 6-1 to progress.
Osasuna got back to winning ways with a 2-0 win at home over Celta Vigo, thanks to a 23rd-minute goal from Facundo Roncaglia, who fired home from outside of the Celta penalty area, before crossing for Jonathan Calleri to head home the second for the Pamplona-based outfit 14 minutes from time.