Harriet Dart shocked British number one Katie Boulter in an extraordinary final-set tie-break to reach the Wimbledon third round.

World number 94 Dart became tearful when she fell 6-2 down in the breaker but won eight of the last 10 points to knock out the 32nd seed.

Boulter’s forehand, usually her main weapon, became increasingly erratic in breezy conditions on Court One as Dart won 4-6 6-1 7-6 (10-8) in just under three hours.

“I wear my emotions on my sleeve so you see everything how I’m thinking, unfortunately, but I’m so happy to be able to get through,” Dart said.

“My head-to-head is absolutely woeful against Katie Boulter so I wasn’t expecting too much but at the same time I just tried my best out there and even though I was down in that tie-break I just thought ‘give it everything, no regrets’ and I’m really pleased to be able to battle through.”

The 27-year-old will play the unseeded Wang Xiyu of China next.

Briton Lily Miyazaki lost in the second round of Wimbledon as she failed to win a game against Daria Kasatkina.

The Russian 14th seed – who won the Eastbourne title on Saturday – came through 6-0 6-0 in 50 minutes.

World number 148 Miyazaki produced the biggest win of her career when she beat Tamara Korpatsch in the first round, but could not replicate her performance.

Miyazaki, 28, struggled to keep the ball in play, with 31 unforced errors among the 53 points won by Kasatkina.

Kasatkina, 27, will play Spaniard Paula Badosa in the third round.