Having secured the first completed victory of this year’s tournament at 12:15 local time, Raducanu headed back out onto the practice courts at about 14:00.
New coach Francisco Roig, who agreed to join Raducanu’s team earlier this month, worked on her forehand returns from the baseline in a light-hearted session lasting about half an hour.
Roig has become a vocal presence in her courtside box – although there was little guidance or input needed against world number 130 Shibahara.
But, with the match taking place on a noisy Louis Armstrong Stadium, Raducanu said it would not have mattered even if Roig was trying to deliver instructions.
“You don’t really hear it unless you’re kind of lip-reading,” she said.
“I probably don’t take in much of what he’s saying, but when I feel like I really need it, I will go over.
“For the most part, especially when you’re in a match like today, I felt like I had most things under control on my side of the court.”
Despite only working with each other for a few weeks, the pair appeared to have gelled.
Lengthy car journeys to the Cincinnati Open, with Roig taking driving duties, strengthened their bond, and Roig has since started teaching Raducanu some Spanish.
“If anyone asks if I can say something in Spanish, I just bosh out some verb conjugations,” Raducanu joked.
“It’s not exactly the best conversation starter but I’m getting there.”
Chiropractic Jerome Poupel, a Frenchman based in London, provides another voice in Raducanu’s new-look team – as well as a quirky back story.
Poupel has previously worked with Formula 1 driver David Coulthard and racing legend AP McCoy, as well as treating horses.
“I don’t really know what he does with horses – I don’t ask questions! It just seems to work on them,” Raducanu said.
“I am a horse on my horoscope so I don’t know if that has any correlation.”
