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(CNN) -- Russian tennis chief Shamil Tarpischev apologized Saturday for referring to Serena and Venus Williams as the "Williams brothers" during a TV chat show. Tarpischev, who is also a member of the International Olympic Committee (IOC), has already been carpeted by the WTA for "insulting and demeaning" remarks about the American siblings, being hit with a $25,000 fine and a one-year ban from tennis activities. Tarpischev is the chairman of the Kremlin Cup tournament in Moscow which is finishing this weekend and has held a string of leading positions in sports administration. He made the faux pas on a light night talk show in Russia -- Evening Urgant -- sitting next to former WTA star Elena Dementieva.

Every match is going to be tough, so you have to be ready for that,"
Venus Williams told the official WTA website ahead of the start of the tournament Monday.