On Thursday, the Brazil Open in São Paulo used four former stray dogs taken in by a shelter as "ball dogs" to retrieve tennis balls from the court during a match between Spain’s Roberto Carbelles Baena and Portugal’s Gastao Elias.

The four lucky dogs were Frida, Mel, Isabelle and Costela (the Portugese word for "rib," so named because of how skinny he was when he was found in an abandoned lot).

Andrea Beckert, a trainer from the Association of Animal Wellbeing, which currently shelters about 1,200 dogs, hopes the stunt helped raise awareness of the plight of shelter dogs. In an interview with CNN she said, "We want to show that abandoned dogs can be adopted and trained. After all, it's not easy to get a dog to only pick up the lost balls, and then to give them up!"

Looks like the retrieving part went great, while the returning them to the players or trainers part, maybe not as much. Still—sports has never been so cute.

"Nope, it's mine now, human."