Aus Open 2018: Matches to look out for on day seven

A selection of the key Australian Open fourth-round clashes taking place on Sunday (January 21).

Bulgaria's Grigor Dimitrov reacts after winning a point against Russia's Andrey Rublev.   -  AFP

Entertainment is guaranteed for tennis fans with a handful of engrossing clashes lined up one after another on day seven of the Australian Open 2018. Of course, the high-profile names involved in these clashes, in both the men's and women's singles, could bow out too.

Nick Kyrgios vs Grigor Dimitrov

This is easily the match of the day and home boy Kyrgios takes on the Bulgarian Dimitrov in the evening at the Rod Laver Arena.

Dimitrov was made to toil hard for his second and third-round wins, which he secured in four and five sets respectively. Therefore, he has spent more time on court and fatigue could be a factor come Sunday.

Kyrgios, on the other hand, has been impressive in terms of the results achieved, considering the quality of his opponents in Viktor Troicki and Jo-Wilfried Tsonga. He comes into this contest with his confidence sky high and has a chance of reaching his second Australian Open quarterfinal.

Dimitrov leads the head-to-head record between this duo by 2-1.

Read: Berdych ends del Potro's Aus Open campaign

M. Rybarikova vs Caroline Wozniacki

Wozniacki has enjoyed a reasonably smooth ride to the Australian Open fourth round and Rybarikova may yet provide her stiffest test of the tournament.

The Dane leads the head-to-head record against her Slovakian opponent by 3-1, but this match has the makings of being an even contest.

Rafael Nadal vs D. Schwartzman

The Spaniard has been in commanding form, but he needs to be at his best to get past his fourth-round Argentine opponent.

Schwartzman beat Ukraine's Alexandr Dolgopolov in the third round and has shown himself to be durable by winning a five-setter in his opening-round match against Dusan Lajovic and the Dolgopolov match was a four-sets affair as well.

Read: Nadal's best required against in-form Schwartzman

Being a morning match, the fitness levels of the players will also be put to the test.

Nadal leads the head-to-head against Schwartzman by 3-0.

P. Carreno Busta vs Marin Cilic

Cilic has been very much flying under the radar so far and is reaching a point where some of the spotlight is going to fall on him.

Spaniard Busta progressed through to the third round with Giles Simon retiring hurt, though Busta had won the first set 6-2 and was leading 3-0 in the second set. He beat the 23rd seed, Gilles Muller, in the third round and will no doubt be looking forward to this contest against the world No. 6.

Cilic has won the only match between this duo.

D. Allertova vs Elina Svitolina

Ukraine's Svitolina is among the favourites to win the Australian Open 2018 and she has had a reasonably easy route to the fourth round, with Czech Republic's Katerina Siniakova the only one challenging her so far.

Allertova came through the qualifying round and has put in reasonably strong showings in each of her three matches so far.

Svitolina, no doubt, is the favourite for this match and a reverse for her should be considered an upset.

Allertova, though, actually has won the only previous match between this duo, beating Svitolina at last year's Qatar Open.