Belinda Bencic says she is still experiencing left wrist problems after falling in the first round of the WTA tournament Biel to Carina Witthoeft.

Bencic has won just one singles match this season in seven WTA tournaments, and had another singles win in a Fed Cup tie.

"I made too many errors," Bencic told Swiss press following the defeat in Biel. "My serving was also not good."

A former Top 10 player, Bencic has dropped to No. 131 in the rankings. Looking for wins, she played the ITF Pro Circuit event at Croissy-Beaubourg last week, but had to retire with a wrist injury in the quarterfinals.

The injury remained a problem at Biel, indicated the 20-year-old.

"Physically, it's not enjoyable," Bencic said, but added that she was "confident" about her appearance in next week's Fed Cup semifinals.

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Another former Top 10 player, Eugenie Bouchard, is playing an ITF Pro Circuit event this week in Indian Harbor Beach, Florida. She needed three sets to defeat 601st-ranker teenager Brianna Morgan, but advanced to the second round.

The former Grand Slam finalist had not competed in an ITF event since Nottigham in 2013. Having fallen outside the Top 50, Bouchard is winless in five events on the WTA tour.

Off the court, Bouchard's attorney filed a court document asking for the USTA to be sanctioned in the ongoing lawsuit about her fall at the 2015 U.S. Open. The letter sent to the court accuses the USTA of "knowingly and willfully destroying security camera footage" relating to the case.

According to the letter, as litigation was beginning in 2015, the USTA was told by Bouchard's representatives to keep all records and footage relevant to the incident. At the time, the USTA provided a three-hour security tape of the entrance to the women's locker room that evening.

But a few months ago, Bouchard's team spoke to the WTA trainer who was present that evening, and requested additional footage of other areas it said would substantiate the timing of events. The USTA replied that it could not provide the extra tapes because of its general practice of keeping security footage for 160 days.

"We asked for all of the tapes during and around that time to show where Genie was, where their employees were," Bouchard's lawyer, Benedict Morelli, told Canadian sports network TSN. "We sent them a preservation letter, which put them on notice that they had to preserve everything surrounding this lawsuit and they knew that."

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Bouchard sued the USTA when she slipped around the locker room area at the 2015 US Open, alleging that a "slippery, foreign and dangerous substance" was present and the area was dimly lit in addition to being unattended. She did not complete another WTA match for the rest of the season because of a concussion. The USTA did not admit any wrongdoing in its defence filing.

Recent talks between the two sides did not produce a settlement.