Paolini somehow retrieved a volley on the forehand side with an improvised backhand swing, the singles finalist showing her recent form with impressive shotmaking to break back.
With the Italians forcing the issue, the rallies raised to another level. But Siniakova and Gauff were equal to the task, their touch at the net was rock solid and the American served out a memorable day in her favourite city.
"I think because we are really good players, singles and doubles, I think it wasn't so hard and we know each other well," said Siniakova, reflecting on their instant success as a first-time partnership.
"We kind of needed to figure out how the other one is playing, but from my side, that we had no problem with it. We really trusted each other, and I think the combination was working really well. Of course when we won two, three matches, it was really helping and we got the confidence. For first time it was really, really good."