Cameron Norrie and Katie Boulter are ranked 24th and 67th in the world respectively Cameron Norrie and Katie Boulter were both knocked out in the third round of the Miami Open, ending British hopes in the singles in Florida. Norrie, 30, suffered a 7-5 6-7 (4-7) 6-4 defeat by 21-year-old Alex Michelsen of the United States in his first match of the tournament. The 23rd seed, who replaced Jack Draper as British number one last week, lost a tight first set after Michelsen finally broke his serve with his sixth set point of the 12th game. Norrie bounced back from a 3-0 deficit in the second set to force a tie-break which he won to force a deciding set. However, a break in the third game of the third set proved pivotal for Michelsen as he served his way into the last 16 on home soil. British number three Boulter, who had reached the third round of a WTA 1000 event for the first time in more than a year, succumbed 6-3 7-5 to 13th seed Karolina Muchova of the Czech Republic.…