Monday at Wimbledon: Kyrgios, Halep and Nadal on center court

Australian Nick Kyrgios celebrates his victory over Greek Stefanos Tsitsipas in the third round at Wimbledon

Following Middle Sunday action at Wimbledon, the fourth rounds of men's and women's singles will conclude on Monday.

There won't be the frenetic action of the "manic Monday" of the past, but it still promises to be full of fireworks at the main show grounds.

The first match on center court is a clash between two unranked players as Nick Kyrgios takes on American Brandon Nakashima.

Maverick Australian Kyrgios was embroiled in a heated third-round game on Saturday as he took on fourth seed Stefanos Tsitsipas, who called him 'evil' and a 'bully' afterwards, and he also made headlines after beating Filip Krajinovic in the second round when he described himself as one of the "most important people" in tennis.

Kyrgios talks to an official during his game against Tsitsipas

"I am extremely confident in myself. All the challenges I have overcome in my life. Proud to be here and to do it my way. To be able to produce tennis like this at Wimbledon is a dream come true for any tennis player," said the 2014 quarter-finalist, who was fined $10,000 for spitting at a fan during his first-round match.

"Well, I didn't want to remind people that I'm good; I know I'm good," he continued. "I just feel like people don't respect me sometimes because of other things I do."

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Kyrgios now has another chance to demonstrate his abilities as a tennis player against Nakashima who beat Colombian Daniel Galan in straight sets in the last round after beating 13th seed Denis Shapovalov in the second round.

Second place on center court will be 2019 champion Simona Halep against fourth seed Paula Badosa of Spain who defeated Petra Kvitova in the final round.

None of the players have dropped a set in the tournament so far and a fierce fight looks on the cards.