Emma Raducanu withdraws from the Great Britain squad for next week's Billie Jean King Cup tie in the Netherlands to "look after her body".
Britain's Fran Jones says her heart "worked a little too hard" after she collapsed during a match in Colombia.
Daria Kasatkina says she feels "emotional" after switching allegiance from Russia to Australia but "didn't have much choice".
Alexander Zverev spurns chance to close gap on Jannik Sinner, plus Emma Raducanu's run - the latest edition of our weekly tennis round-up.
Czech teenager Jakub Mensik beats childhood idol Novak Djokovic to win the Miami Open, having come close to withdrawing hours before his first-round match with a knee injury.
Its founders hoped to build a digital utopia but were unable to control the dark side of their creation