Aryna Sabalenka says she fell into 'deep, dark hole' mentally in shock defeat to Diana Shnaider
Big blow for Danes as Harder is ruled doubtful for crucial World Cup qualifier
Diana Shnaider stuns world number one Aryna Sabalenka at Roland Garros to make semi-finals
Dominant Sabalenka eyes semis while Polish sensation and besieged Auger-Aliassime face threats
