Saturday's outing to Wimbledon is the royal pair's first official engagement together without their husbands.
Williams spoke about her friendship with Markle in a post-match press conference.
This year F1 ace Lewis Hamilton, golfer Tiger Woods and Dame Anna Wintour offered their support from behind her team.
US indicts 12 Russian spies in 2016 election hacking
He maintained, however, that Russian Federation has no interest meddling in United States elections and never will. It said there was no evidence that the 12 people charged were linked to military intelligence or hacking.
Month After Summit, Trump Tweets "Very Nice" Letter From Kim Jong
But Pompeo gave a rosier account saying the two sides had substantive discussions on next steps toward denuclearisation. Recent evidence actually suggests that the rogue nation continues to build up their nuclear infrastructure.
Thailand Cave Rescue: All 12 Boys And Coach Rescued From Flooded Cave
The rescued boys had not been identified out of respect for the families whose sons were still trapped, officials had said. They were not the only members of football's fraternity to send their support to the Thai boys and their rescuers.
On the accessories front, Meghan toted a white, wide-brimmed J.Crew hat featuring a black band which we'll no doubt see her don later when the sun shines.
Since joining The Firm on May 19, her diary has been jam-packed with royal events - including a day out at Ascot, a family wedding and, this week, her first foreign tour.
The following day, both couples joined The Queen and other senior royals for a day of celebrations to mark the RAF's 100th anniversary, which included a fly-past at Buckingham Palace, giving Meghan her second-ever balcony experience.
Meghan, who was at the tournament as Kate's guest, stood slowly and applauded when Williams lost in straight sets to Germany's Angelique Kerber.
On Sunday, Kate and husband Prince William will watch the men's singles final on Centre Court.