The British player reached the third round in three Grand Slam tournaments Grand Slams in the current campaign.
Emma Raducanu from Great Britain has pulled out of her remaining competitions in 2025 because of a medical condition she has been fighting in recent days.
The 22-year-old was due to play in tournaments in Tokyo and Hong Kong but opted to return home to rest and recuperate prior to beginning plans for the 2026 season.
Those preparations are set to feature coach Francisco Roig, as both individuals have decided to continue collaborating for the upcoming season.
The tennis professional required blood pressure checks during her first-round match with Ann Li in Wuhan last week and retired when losing 6-1 4-1 on a very muggy occasion.
She again required a visit from the doctor at the Ningbo Open this week, where she was defeated in three sets to Chinese wildcard Zhu Lin in the first round.
She was also playing far from freely in the third set in the match with Zhu because of the lower back problem that has troubled her during parts of the season.
These outcomes signaled a promising season, in which she climbed into the international top 30 after more than three years in more than three years, finished with a trio of defeats.
Raducanu had three match points then was defeated by Pegula in the third stage in last month's Beijing event.
Raducanu won 28 victories this year and reached the semi-finals in the Washington tournament, but her standout performance was at the Miami event in March.
The British number one made the last eight of the WTA 1000 event, beating eighth seed Emma Navarro en route prior to a loss in three sets to fourth-ranked Pegula.
She worked with Mark Petchey between Miami and Wimbledon, with Roig assuming the role for the US Open.
The original arrangement with the former trainer of Nadal was for the remainder of the year but the collaboration persists, with planned training sessions in the coming months.
The athlete revealed that the trial session alongside Roig after Wimbledon was like a "covert operation" as they tried to keep the meeting secret.
The player was close to overcoming Sabalenka, the world number one at the first competition with Roig in August's Cincinnati tournament.
The coach also accompanied Raducanu in New York, where she made the third stage prior to losing to 2022 Wimbledon champion Elena Rybakina.
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