Solja, the 13th seed and highest ranked player in the world who is not born in Asia, never seemed comfortable and lost 4-1 to Hungarian opponent Szandra Pergel, the world number 99.

She claimed to lose concentration after her forehand serves were ruled illegal and insisted officials judged her particularly harshly because of her high ranking. 

"At the beginning I had everything under control, and in the second set I was also leading, but there was one moment where the umpire said I was doing wrong service," Solja said.

"From that moment I lost my concentration and felt unsafe with my game because I had to change with backhand service, which I don't usually do.

"I think it's not fair, because when they have workshops for the umpires they take the top players and they watch and analyse their videos. 

"The umpire faulted my serves many times because of that - I think it’s not fair. 

"Pergel is not in this list, so it’s my problem that I’m a good player and they look how you play."

On a bad day for the German women's team, 25th seed Sabine Winter also crashed out in a 4-3 loss to United States' Lily Zhang.

National champion Kristin Silbereisen is the only home player still in the draw after a 4-2 win over Yu Mengyu of Singapore.

There were no such problems for China as all five of their entrants cruised through the opening two rounds.

Chen Meng was the only one to even drop a single set in second round action, triumphing 4-1 over Lay Jian-fang of Australia.

Two rounds of competition took place in the women's singles today compared with one in the men's.

Lubomir Pistej of Slovakia produced the biggest shock of the day on the men's side.

The world number 156 stunned 11th seed and South Korean number one Jeoung Young-sik 4-1 to set-up a second round tie with Benedek Olah of Finland.

“I surprised him, not myself," Pistej said afterwards.

"All players from the top 100 can play at a high enough level to beat anyone.”

Nineteenth seed Kristian Karlsson of Sweden also crashed out at the first hurdle in a 4-1 loss to Liao Cheng-ting of Taiwan.

Third seed Xu Xin of China was also made to work hard in being stretched to six sets in a 4-2 win over Tomas Poliansky of Czech Republic.

Chinese head coach Liu Guoliang has said that Xu will no longer be considered among the top four players in the Chinese team if he does not perform well this week.

European and German number one Dimitrij Ovtcharov was also pushed to six games against a Czech opponent before beating Lubomir Jancarik 4-2.

All other top seeds progressed comfortably.

A dream last 16 clash was set-up in the men's doubles as Olympic singles champion Ma Long and German partner Timo Boll beat Indian duo Sharath Kamal Achanta and Sathiyan Gnanasekaran 4-1.

They will next face all-Chinese duo Fan Zhendong and Xu, who beat Tristan Flore and Emmanuel Lebesson of France 4-1 today.