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INDIAN WELLS, CALIFORNIA - OCTOBER 09: Daniel Altmaier of Germany returns a shot to Grigor Dimitrov of Bulgaria during the BNP Paribas Open at the Indian Wells Tennis Garden on October 09, 2021 in Indian Wells, California. (Photo by Tim Nwachukwu/Getty Images)

INDIAN WELLS, CALIFORNIA - OCTOBER 09: Daniel Altmaier
of Germany returns a shot to Grigor Dimitrov of Bulgaria during the BNP Paribas Open at the Indian Wells Tennis Garden on October 09, 2021 in Indian Wells, California. (Photo by Tim Nwachukwu/Getty Images)