NEW YORK (Reuters) - The Tennis Integrity Unit (TIU) is looking into a first-round match at the U.S. Open after irregular betting patterns were detected but the USTA said on Wednesday it was confident nothing nefarious had taken place.

Sept 7 (Reuters) - Latest news from the 10th day of the U.S. Open tennis championships on Wednesday (all times GMT):

Sept 7 (Gracenote) - Results from the U.S. Open Men's Singles Quarterfinal matches on Wednesday

Sept 7 (Gracenote) - Results from the U.S. Open Mixed Doubles Semifinal matches on Wednesday

NEW YORK (Reuters) - Karolina Pliskova, a grand slam underachiever, took a big step toward shedding that unwanted label by sweeping past Croatian teenager Ana Konjuh 6-2 6-2 on Wednesday to roar into the semi-finals of the U.S. Open.

Sept 7 (Gracenote) - Results from the U.S. Open Men's Doubles Quarterfinal matches on Wednesday

Sept 7 (Gracenote) - Results from the U.S. Open Women's Singles Quarterfinal matches on Wednesday

NEW YORK (Reuters) - Novak Djokovic's strange U.S. Open took another bizarre turn as he advanced to the semi-finals on Tuesday when Frenchman Jo-Wilfried Tsonga retired at the start of the third set, trailing 6-3 6-2.

NEW YORK (Reuters) - Former world number one Caroline Wozniacki reached the semi-finals of the U.S. Open on Tuesday with a ruthless 6-0 6-2 win over wounded Latvian Anastasija Sevastova.