BARCELONA—Antoni Gaudi was unafraid to push boundaries when it came to his line of work. As a result of seeing his visions through, Gaudi is one of the most celebrated architects today, with a lasting imprint in Barcelona.

Outside of his renowned Casa Milà ("La Pedrera"), two young artists of a different craft came together. On Monday, locals packed a blocked-off section of Passeig de Gràcia to see rising home favorite Carlos Alcaraz and Top 10 star Felix Auger-Aliassime up close.

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Alcaraz and Auger-Aliassime posed for photographs before beginning the fan-friendly activity.

Alcaraz and Auger-Aliassime posed for photographs before beginning the fan-friendly activity.

In town for the Barcelona Open Banc Sabadell, the Spaniard and Canadian rallied for a bit of mini tennis before showing off their footie skills. Afterwards, the two circled around to pose for selfies and sign autographs for enthusiastic fans.

Both competitors have byes at the ATP 500 event. Auger-Aliassime is seeded third and is looking for some momentum after a 1-5 stretch. The fifth-seeded Alcaraz landed in the top quarter with incoming Monte Carlo champion Stefanos Tsitsipas, and aims to bounce back from last week's opening loss following his maiden Masters 1000 triumph in Miami.