Elena Svitolina repeated her Wimbledon victory over Victoria Azarenka in the first round of the DC Open with supporters given a warning the players would not shake hands at the end of the match.
World number one Iga Swiatek waltzed her way to another title in her home country of Poland on Sunday.
The WTA said it would be "evaluating the issue further with the event" after Russian player Vera Zvonareva was blocked from entering Poland for a tournament.
Chinese tennis star Shuai Zhang has finally received an apology from opponent Amarissa Toth after her dramatic exit from WTA Budapest.
Simona Halep was highly critical of her treatment at the hands of the International Tennis Integrity Agency (ITIA) after her latest doping case hearing was postponed.
British tennis player Harriet Dart has once again highlighted the ongoing problem of online abuse in the sport after her first-round defeat in the qualifiers of the Italian Open in Rome.