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Ajla Tomljanovic served impressively as she made a promising start to her grasscourt season beating Xinyu Wang 6-4 6-4 in 73 minutes in Nottingham.
Last year's Wimbledon quarter-finalist was rarely troubled, winning 82 per cent on first serve with six aces.
The Australian women's No.1, fifth seed in Nottingham, is now the highest ranked player in her quarter of the draw after the shock retirement of No.2 seed Emma Raducanu - who Tomljanovic beat at Wimbledon last year.
The 19-year-old had to quit seven games into her match against Viktorija Golubic with a side injury.
Playing her first match in her home country since she won the US Open in September Raducanu said she had "no idea" whether she will be fit for Wimbledon.
"The first game, an absolute freak, I think I pulled something, I am not really sure what exactly happened," she said.
Raducanu, who has now retired in matches three times since winning in New York, added: "I need to get a scan first. I am not going to 'Google doctor' myself. I will get it checked out, then we will see from there.
There were also wins in Nottingham for the first, third and fourth seeds, Maria Sakkari, Camila Giorgi and Shuai Xhang, respectively.
In s-Hertogenbosch, in the Netherlands, all four Australian women in the 32-player event were knocked out in the opening round.
Storm Sanders came back from 1-4 down in the tie-break to take a 64-minute first set against Elise Martens, but lost the next two sets to the Belgian No.8 seed 6-1 6-2.
Olivia Gadecki went down 3-6 6-4 4-6 to Ukraine's Anhelina Kalinina, Taylah Preston lost similarly to home player Arianne Hartono, 4-6 6-3 4-6, and Daria Saville was beaten in straight sets 7-6 (7-3) 6-3 by American Catherine McNally..