Katie Boulter has overcome a series of mediocre results on the WTA Tour's Asian swing to advance to the Pan Pacific Open semifinals with a 6-2, 6-1 win over Bianca Andreescu on Friday. The 28-year-old British player lost in recent weeks in the first round at Wuhan and in the second round to Coco Gauff at the China Open. But she dominated Andreescu, the 2019 U.S. Open champion who beat Serena Williams in straight sets in that final, on Friday in the first of four quarterfinals in Tokyo.