Serena Williams and Ons Jabeur have pulled out of their Eastbourne International doubles semi-final due to an injury concern just days before Wimbledon begins.
Organizers said Tunisian world number three singles star Jabeur was troubled by a right knee injury, forcing her brief alliance with Williams to come to an end.
They had won through two rounds in increasingly impressive style, with Williams making her return to the WTA Tour, having not played competitive tennis since injuring an ankle at Wimbledon last year.
The 40-year-old Williams was clearly enjoying the partnership with Jabeur, who in May became the first African or Arab woman to win a WTA 1000 singles title when she triumphed at the Madrid Open.
They had named themselves 'Onsrena' and were due to face Aleksandra Krunic and Magda Linette in the semi-finals before news emerged on Thursday of their withdrawal.
No details of the seriousness of Jabeur's injury were disclosed, and it may prove a precautionary withdrawal given Wimbledon is so close, with the latter starting on Monday.
Jabeur won a title on grass in Berlin last week, showing she could pose a threat to top seed Iga Swiatek, providing she is not hampered by injury.
Williams, a 23-time grand slam singles champion, will also be competing at Wimbledon after being handed a wildcard entry into the tournament where she has won seven singles titles.