DOHA, Feb. 13, 2018 (Xinhua) -- Mona Barthel of Germany hits a return during the single's first round match against Agnieszka Radwanska of Poland at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Radwanska won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Ekaterina Makarova of Russia celebrates after the single's first round match against Zhang Shuai of China at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Ekaterina Makarova won 2-0. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Zhang Shuai of China reacts during the single's first round match against Ekaterina Makarova of Russia at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Ekaterina Makarova won 2-0. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Katerina Siniakova of Czech Republic reacts during the single's first round match against Naomi Osaka of Japan at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Katerina Siniakova lost 0-2. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Ekaterina Makarova of Russia celebrates after the single's first round match against Zhang Shuai of China at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Ekaterina Makarova won 2-0. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Katerina Siniakova of Czech Republic hits a return during the single's first round match against Naomi Osaka of Japan at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Katerina Siniakova lost 0-2. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Naomi Osaka of Japan hits a return during the single's first round match against Katerina Siniakova of Czech Republic at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Naomi Osaka won 2-0. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Maria Sharapova of Russia attends the press conference after the single's first round match against Monica Niculescu of Romania at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Monica Niculescu won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Monica Niculescu of Romania celebrates during the single's first round match against Maria Sharapova of Russia at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Monica Niculescu won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Agnieszka Radwanska of Poland greets the audiences after the single's first round match against Mona Barthel of Germany at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Radwanska won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Maria Sharapova of Russia celebrates during the single's first round match against Monica Niculescu of Romania at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Monica Niculescu won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Maria Sharapova of Russia hits a return during the single's first round match against Monica Niculescu of Romania at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Monica Niculescu won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Agnieszka Radwanska of Poland greets the audiences after the single's first round match against Mona Barthel of Germany at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Radwanska won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Agnieszka Radwanska of Poland hits a return during the single's first round match against Mona Barthel of Germany at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Radwanska won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Monica Niculescu of Romania hits a return during the single's first round match against Maria Sharapova of Russia at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Monica Niculescu won 2-1. (Xinhua/Nikku/IANS)moreDOHA, Feb. 13, 2018 (Xinhua) -- Agnieszka Radwanska of Poland hits a return during the single's first round match against Mona Barthel of Germany at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Radwanska won 2-1. (Xinhua/Nikku/IANS)more