During the second set, she frequently bent over with her hand to her stomach, showing signs of discomfort.
A first trainer was followed by a second shortly after, with one appearing to listen to her breathing as she sat on Court One.
“Emma must be really hurt if she came to the decision to retire. To play as a Brit at home is unbelievable, so I’m really sorry for her. I wish we could have finished it. It’s sport, it happens. I’m really wishing her all the best.”
Wimbledon posted their appreciation of Raducanu’s debut run in a statement on Tuesday.
“We were very sad to see Emma forced to withdraw from her match last night and wish her all the best with her recovery. She should be commended for the poise and maturity she has shown throughout the Wimbledon Fortnight and we very much look forward to welcoming her back to Wimbledon next year and in the years to come.”
The end of the road
It was a disappointing end to a remarkable breakthrough competition for the young British player, who was ranked No. 338 before the start of the tournament.
Raducanu beat two top-50 opponents, Marketa Vondrousova and Sorana Cirstea, on her way to the last 16 and became a true fan favorite not just with her tennis abilities, but also with her acts of humility after she was seen cleaning up her own trash after her second round victory.
Raducanu and Tomljanovic were forced to wait until late into the evening to begin their fourth-round meeting due to a five-set thriller between Alex Zverev and Felix Auger-Aliassime before them.
The 75% capacity crowd was clearly in Raducanu’s corner, cheering every point she won like a match winner.
However, after failing to convert some early break points, world No. 75 Tomljanovic showed her experience, claiming the first set under the Court One roof.
She was firmly in control of the second set when Raducanu retired, and the possibility of facing her fellow Australian in the next round has got Tomljanovic excited.
Eight-time Wimbledon champion Roger Federer progressed to the quarterfinals of the grand slam on Monday for the 18th time, extending his own record at the competition.
The Swiss looked relatively comfortable on his way to beating 23rd seed Lorenzo Sonego 7-5 6-4 6-2 on Centre Court in the fourth round, extending his lead at the top of the all-time list for most Wimbledon quarterfinal appearances, ahead of Jimmy Connors.
Federer will face either second seed Daniil Medvedev or 14th seed Hubert Hurkacz in the next round.