London - Third seed Karolina Pliskova was knocked out of Wimbledon on Monday, losing to her Czech compatriot Karolina Muchova in a result which means Ashleigh Barty will remain world number one.

The world number 68 Muchova triumphed 4-6, 7-5, 13-11 in a three-hour, 17-minute tie which came agonisingly close to supplying the tournament's first ever 12-12 final set tie-break.

Muchova, 22 and making her Wimbledon debut, will face Ukraine's Elina Svitolina on Tuesday for a place in the semi-finals.

Australian Barty will stay as world number one despite being knocked out of Wimbledon earlier Monday by Alison Riske.

Wimbledon results on Monday (x denotes seeding):

Men

4th round

David Goffin (BEL x21) bt Fernando Verdasco (ESP) 7-6 (11/9), 2-6, 6-3, 6-4

Roberto Bautista Agut (ESP x23) bt Benoit Paire (FRA x28) 6-3, 7-5, 6-

Sam Querrey (USA) bt Tennys Sandgren (USA) 6-4, 6-7 (7/9), 7-6 (7/3), 7-6 (7/5)

Rafael Nadal (ESP x3) bt Joao Sousa (POR) 6-2, 6-2, 6-2

Women

4th rd

Alison Riske (USA) bt Ashleigh Barty (AUS x1) 3-6, 6-2, 6-3

Serena Williams (USA x11) bt Carla Suarez Navarro (ESP x30) 6-2, 6-2

Barbora Strycova (CZE) bt Elise Mertens (BEL x21) 4-6, 7-5, 6-2

Johanna Konta (GBR x19) bt Petra Kvitova (CZE x6) 4-6, 6-2, 6-4

Elina Svitolina (UKR x8) bt Petra Martic (CRO x24) 6-4, 6-2

Karolina Muchova (CZE) bt Karolína Pliskova (CZE x3) 4-6, 7-5, 13-11

Simona Halep (ROU x7) bt Cori Gauff (USA) 6-3, 6-3

Zhang Shuai (CHN) bt Dayana Yastremska (UKR) 6-4, 1-6, 6-2