2021 İstanbul Cup – Singles

Sorana Cîrstea defeated Elise Mertens in the final, 6–1, 7–6(7–3) to win the Women's Singles tennis title at the 2021 İstanbul Cup. This was Cîrstea's first title since 2008, and she did not drop a set throughout the entire tournament. Patricia Maria Țig was the defending champion, but she chose not to participate this year.

2021 İstanbul Cup – Singles

Sorana Cîrstea defeated Elise Mertens in the final, 6–1, 7–6(7–3) to win the Women's Singles tennis title at the 2021 İstanbul Cup. This was Cîrstea's first title since 2008, and she did not drop a set throughout the entire tournament. Patricia Maria Țig was the defending champion, but she chose not to participate this year.