Serena Williams says comments by the head of the Russian Tennis Federation referring to her and older sister Venus as “brothers” were bullying, sexist and racist, and that she supported the one-year suspension imposed by the WTA against the official.

Shamil Tarpischev was also fined $US25,000 ($A27,000) for making the comments on Russian television. He also said the sisters were “scary” to look at.

“I think the WTA did a great job of taking (the) initiative and taking immediate action to his comments,” Serena Williams said on Sunday in Singapore ahead of her WTA Finals defence.

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“I thought they were very insensitive and extremely sexist as well as racist at the same time. I thought they were in a way bullying.”

Asked whether he regretted his comments, Tarpischev told AP on Saturday at the Kremlin Cup that the program on which he spoke was “a humorous show”.

When asked about his ban, Tarpischev said: “I can’t comment. I don’t understand it.”

In a statement released later by the Russian Tennis Federation, Tarpischev denied any “malicious intent” and said his quotes had been taken out of context.

The WTA said it would seek his removal as chairman of the Kremlin Cup tournament, which ends Sunday.

Russian tennis official Shamil Tarpischev. Photo: AAP

Russia’s Maria Sharapova, also in Singapore for the WTA Finals, condemned her compatriot’s comments.

“I think they were very disrespectful and uncalled for, and I’m glad that many people have stood up, including the WTA. It was very inappropriate, especially in his position and all the responsibilities that he has not just in sport, but being part of the Olympic committee,” she said.

Tarpischev has been chairman of the Kremlin Cup, Russia’s only WTA event, for all of its 18 years as a women’s tour event, and is also a member of the International Olympic Committee. During the 1990s, he was the personal tennis coach to Russian President Boris Yeltsin and served as his adviser on sports matters.

He made his comments during an appearance on a Russian talk show this month alongside former Olympic singles champion Elena Dementieva. When Dementieva was asked what it was like playing against the Williams sisters, Tarpischev interjected and called them the “Williams brothers.”

He also said that “it’s scary when you really look at them”.