Garbine Muguruza has slammed Barbora Krejcikova over her behaviour during her loss to the Czech at the US Open late on Sunday night.

Krejcikova won the match 6-3, 7-6 but as the two players came to the net a very quick handshake saw a disgruntled Muguruza mutter “so unprofessional” as she returned to her chair.

Garbine Muguruza was unhappy her opponent took a timeout. Photo: Darren Carroll/USTA

Asked for her thoughts on Krejcikova after the game she added: “Well, I think, between players, you know a little bit how to behave in certain moments.”

“And, yeah, I wasn’t very happy at the end of the match.”

Muguruza’s frustration was due to No.8 seed Krejcikova’s behaviour towards the end of the second set when she took a medical timeout while down 6-5 after saying she wanted to see the trainer.

Krejcikova then came out firing and won seven points in a row.

Barbora Krejcikova won the match in straight sets. Photo: Darren Carroll/USTA

Muguruza and her coaching staff also showed their dismay at the 2021 French Open champion who took long breaks between points, slowly walking over to her towel.

Krejcikova said she wasn’t well enough to give a post-match interview on court but later explained how she felt ‘dizzy’ and ‘couldn’t breathe’.