Rafael Nadal unhappy with umpire in Kei Nishikori clash

Rafael Nadal celebrates his victory over Gael Monfils in their Australian Open third round match on January 18, 2014
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Rafael Nadal slams umpire Eva Asderaki following his fourth-round victory over Kei Nishikori in the Australian Open.

Rafael Nadal has criticised umpire Eva Asderaki following his fourth-round victory in the Australian Open.

The Spaniard was called for a violation of the 20-second rule at deuce while the match against Kei Nishikori sat at 4-4 in the third set.

"I don't want to change the rule," BBC Sport quotes Nadal as saying. "I accept that sometimes I was slow. I respect that. The negative thing in my opinion is not the warning, but the timing of it.

"You can choose another moment to do it, not that one. She didn't advise me before the second warning that I was still going slow. It's a normal thing, for the referee to help the player a little bit, and say, 'Rafa, you are going too slow'."

Nadal will take on Grigor Dimitrov in the quarter-finals.

Grigor Dimitrov of Bulgaria celebrates his win over Roberto Bautista Agut of Spain following their men's singles match on day eight of the 2014 Australian Open tennis tournament in Melbourne on January 20, 2014
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ATP RankingsPoints
1Spain Rafael Nadal7,645
2Scotland flag Andy Murray7,150
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,690
5Serbia Novak Djokovic5,325
6Alexander Zverev4,470
7Croatia Marin Cilic4,155
8Austria Dominic Thiem4,030
9Bulgaria Grigor Dimitrov3,710
10Japan Kei Nishikori3,195
11Canada Milos Raonic2,870
12France Jo-Wilfried Tsonga2,690
13Belgium David Goffin2,525
14United States John Isner2,425
15Spain Roberto Bautista Agut2,425
16Pablo Carreno Busta2,385
17United States Jack Sock2,345
18Australia Nick Kyrgios2,325
19Czech Republic Tomas Berdych2,310
20Lucas Pouille2,210