​  Williams’ doubles partner retires in second set of singles match after fallThis content is not available in your location.There was an errorWatch as Victoria Mboko retires in the second set of her singles match against Karolina Pliskova after a heavy fall. The Canadian is scheduled to play with Serena Williams in doubles on Thursday.READ MORE: Williams’ Queen’s campaign in doubt after Mboko injuryAvailable to UK users only.Tennis1 day agoShare pageAbout sharing  BBC Sport