That friendly rapport between the two translated on court, with the pair laughing and high-fiving between points.
Raducanu even had a chat with the crowd while filling up her water bottle, such is the closeness of the stand to the players' chairs.
Backed by a capacity crowd of 1,000, the British number one and two complimented each other well.
"Sometimes on the smaller courts you get a bigger feel for the match because it's more intimate and you hear the support more. I think it puts a really nice feel to it," Raducanu added.
It also gave the two a chance to play on the grass before they begin their singles campaigns on Tuesday.
Raducanu faces Spain's Cristina Bucsa before Boulter takes on Australian qualifier Ajla Tomljanovic.