The first set was over in 31 minutes with the No. 4 seed making the most of a weak Raina serve while saving two break points on her own serve.
Canada's Eugenie Bouchard quelled a second set fightback from India's Karman Kaur Thandi to win 6-2, 7-6 in the round of 16 and book a spot in the singles quarter-final of the Chennai Open WTA 250 tennis tournament.
Kyrgios added that he had been in communication with Tennis Australia chief executive Craig Tiley and United Cup tournament director Stephen Farrow about his injury.
When Saif Ali Khan and Kareena Kapoor-Khan decided to name their firstborn Taimur, Syed Firdaus Ashraf delved into history to bring back into focus the fierce warrior king who bore that name many centuries ago.