Barty was all business during week one at the All England Club, steamrolling her way into the fourth round easily and her ruthless streak was on show to begin Manic Monday - one of the best days of the entire Grand Slam when all the remaining big names come out to play.
After the 23-year-old Queenslander won the opening set, Riske's free-wheeling style was too much for Barty as she lost for the first time in 16 matches.
Barty opened the match with four straight aces but landed only 40 percent of her first serves in the second set and was broken four times in total.
"Sitting there, I got a really good feel for her game".
Naomi Osaka's first-round demise and Monday's fourth-round departure of Karolina Pliskova ensures Barty will extend her stint atop the rankings for at least another two weeks.
During seemingly run-of-the-mill post-match interviews, Barty has been slipping in Disney references to her responses.
"It's my desire to keep working hard to achieve my goals", said Barty, whose on-court style can be described as comfortable.
The 37-year-old Williams advanced to the quarterfinals at Wimbledon for the 14th time.
Muchova won the last three games of her match against Pliskova and converted her third match point with a return that clipped the net cord.
"You just have to look at her stats on a grass court to show just how unsafe she is", Barty said.
The American also made special mention of Wimbledon Chairman Phil Brook for showing her respect even though she never really was a big name.
But the 15-One year-outdated tennis star hadn't expected to bring her prepared remarks because the victor of the match. Martic called for medical treatment on her left leg after the first game of the second set and her movement appeared to be hampered the rest of the way. "It's going to be a huge challenge, but I'm really looking forward to it", she said. "But that's not the case", she said.
Riske was thrilled with the result and said she didn't want the tournament to end despite playing the World's No 1 player. Riske said Monday she's "ready for a war". She used good backhand shots and continued to change the pace of her game in order to get the better off her opponent.
"There might be a beer or two", she said, smiling.
Sensing a real chance to upset the world's top ranked player, Riske pounced and broke again to level the match up at 3-6 6-2.
The 37-year-old American, aiming for a record-equalling 24th Grand Slam title, produced 19 unforced errors, including a freakish mistake when she leaned over the net to hit a volley and had the point docked. Getting to the quarter-finals is incredible but what's most exciting for me is the way I've been fighting.