Anastasia Potapova, a Russian tennis player, was warned by the Women's Tennis Association (WTA) for wearing a Spartak Moscow football shirt ahead of her match against Jessica Pegula.
Her actions were seen as a public show of support for Russia during its invasion of Ukraine.
Iga Swiatek, the world number one player, criticised Potapova for wearing the shirt in the current situation.
Meanwhile, Ukrainian player Lesia Tsurenko withdrew from the tournament due to a panic attack after a discussion with WTA chief Steve Simon regarding the tour's response to the war in Ukraine.
Tensions over the war in Ukraine have come to the fore in tennis with Ukrainian Lesia Tsurenko withdrawing from the Indian Wells tournament due to a panic attack that followed a conversation with the WTA chief about the tour's response to the war in her country.
Russian player Anastasia Potapova wore a Spartak Moscow football shirt which was criticized by Iga Swiatek, who said Russian players should not publicly show support for the country during the invasion.
The WTA issued a warning to Potapova for her actions, while Daniil Medvedev, the highest profile current Russian player, expressed his sympathy for what the Ukrainian players are going through.
The different reactions to these events illustrate the tension in the sport surrounding the conflict in Ukraine, with some players being critical of actions seen to support Russia and others calling for more support for Ukrainian players.