Kevin Krawietz (R) of Germany and Horia Tecau of Romania compete during the semifinals of men's doubles match against Mate Pavic and Nikola Mektic of Croatia at the 2021 National Bank Open in Toronto, Canada, on Aug. 14, 2021. (Photo by Zou Zheng/Xinhua)

Sander Gille (R) and Joran Vliegen of Belgium compete during the semifinals of men's doubles match against Rajeev Ram of the United States and Joe Salisbury of Britain at the 2021 National Bank Open in Toronto, Canada, on Aug. 14, 2021. (Photo by Zou Zheng/Xinhua)

Mate Pavic and Nikola Mektic (back) of Croatia celebrate victory after their semifinal of men's doubles match against Kevin Krawietz of Germany and Horia Tecau of Romania at the 2021 National Bank Open in Toronto, Canada, on Aug. 14, 2021. (Photo by Zou Zheng/Xinhua)

Rajeev Ram (R) of the United States and Joe Salisbury of Britain celebrate scoring during the semifinals of men's doubles match against Sander Gille and Joran Vliegen of Belgium at the 2021 National Bank Open in Toronto, Canada, on Aug. 14, 2021. (Photo by Zou Zheng/Xinhua)

Mate Pavic and Nikola Mektic (R) of Croatia celebrate scoring during the semifinals of men's doubles match against Kevin Krawietz of Germany and Horia Tecau of Romania at the 2021 National Bank Open in Toronto, Canada, on Aug. 14, 2021. (Photo by Zou Zheng/Xinhua)