Hungarian tennis player Panna Udvardy said she received threats targeting her family during a tournament in Antalya and reported the matter to the WTA and Turkish police.
Swiatek is positioned to face American fourth seed Jessica Pegula in the semi-finals.
A round-up of all the tennis action from around the globe.
Indian tennis stars Sania Mirza and Rohan Bopanna advanced to the quarter-finals of the women's and mixed doubles events respectively after notching up contrasting victories with their partners at the Australian Open.
IMAGES from Day 5 of the Wimbledon Championships at All England Lawn Tennis and Croquet Club on Friday.