Miroslava Paskova (top) of Bulgaria competes during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)

Miroslava Paskova (L) of Bulgaria spikes the ball during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)

Maja Savic (R) of Serbia blocks the ball during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)

Players of Bulgaria celebrate during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)

Players of Serbia react during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)

Players of Bulgaria celebrate during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)

Gergana Dimitrova (L) of Bulgaria spikes the ball during a match between Bulgaria and Serbia at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 18, 2019. (Xinhua/Huang Zongzhi)