Sinner The Winner: Jannik Clinches Maiden ATP Tour Title In Sofia [online]. ATP Tour, Inc., 2020-11-14 [cit. 2020-11-14]. Dostupné online. (anglicky)
Melzer/Roger-Vasselin Withdraw In Sofia, Murray/Skupski Crowned Champions [online]. ATP Tour, Inc., 2020-11-13 [cit. 2020-11-14]. Dostupné online. (anglicky)
firstsportz.com
JINDAL, Chhavi. ATP Sofia Open 2020: Where to Watch Sofia Open, Live Stream Details and More » FirstSportz [online]. First Sportz, 2020-11-07 [cit. 2020-11-10]. Dostupné online. (anglicky)
novinite.com
Sofia Open Will Be in September - Novinite.com - Sofia News Agency [online]. Novinite JSC, 2019-03-13 [cit. 2020-11-10]. Dostupné online. (anglicky)