Danielle Collins of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Danielle Collins of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Venus Williams of the United States reacts during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Danielle Collins of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Danielle Collins of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Venus Williams of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)

Danielle Collins of the United States serves during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Danielle Collins of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Danielle Collins of the United States returns a shot during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Danielle Collins of the United States celebrates after scoring during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Danielle Collins won 2-0. (Xinhua/Xiong Qi)

Venus Williams of the United States reacts during the women's singles first round match between Danielle Collins and Venus Williams of the United States at the 2019 WTA Wuhan Open tennis tournament in Wuhan, central China's Hubei Province, on Sept. 22, 2019. Venus Williams lost the match by 0-2. (Xinhua/Xiong Qi)