NOVAK DJOKOVIC has insisted that the Big Four are playing better tennis than they did a few years ago because of the intense rivalries between them to reach the top spot.

The Serb is currently dominating the sport but remains wary of the threats posed by Rafael Nadal, Roger Federer and Andy Murray.

Djokovic defeated Federer at Indian Wells last week to claim his 50th ATP title.

And he is now eyeing a repeat of his Miami Masters win in March, having won the trophy last year at the ATP and WTP hardcourt event.

With Federer not playing Miami by choice and instead taking his family skiing before a fortnight's training back home in Switzerland, the way is open for Djokovic, second seed Nadal and number three Murray to add ranking points before the switch to European clay next month

With more than half a decade of rivalry between the Big Four, any edge is welcome in the heated competition among the elite.

Eight Grand Slam titles winner Djokovic said that the Big Four still keep on pushing and moving the borders, adding that they still keep on improving.

He said: "There is no doubt in my mind that the quality of the tennis is as good as it has ever been between the four of us.

"Roger played fantastic tennis at Indian Wells and the game could have gone either way.

"And Rafa is continuing his comeback from injury and Andy continues to maintain high standards.

"So really there is still a lot of edge to the competition and that is what makes it great for the fans to watch."

Djokovic has now racked up eight Grand Slam titles, while Federer has won 17, Nadal has won 13 and Murray has clinched two.

Meanwhile, Murray will delay his honeymoon until after the tennis season as he looks to continue his recent resurgence.

The Scot will wed long-term girlfriend Kim Sears on April 11, a day before the start of the third Masters event of the year in Monte Carlo.

And while the 27-year-old admits he is unlikely to head to Monaco straight after his nuptials, he will be delaying any honeymoon until the end of the campaign, with the season-ending World Tour Finals taking place in mid-November.

"Depending on how I feel after the wedding there's potential to play Monte Carlo, but I'd say that's unlikely," he said.

"The honeymoon won't be until the end of the year."

Murray is back up to four in the world rankings after dropping as low as 12 in September last year, advancing up the standings with wins in Shenzhen, Vienna and Valencia before reaching a fourth Australian Open final.

The engagement was announced on November 26, the same day Murray split with team members Dani Vallverdu and Jez Green, but despite the upheavals, Murray insists he can easily keep his professional and private lives separate.

"Tennis is important but we also have lives to live as well," he said. "When I'm on the court I'm not thinking 'I'm getting married in a few weeks' but back at the apartment there's time to do that. I can concentrate on both.

"As long as it's not in the forefront of my mind when I'm training then it's fine. It hasn't been a problem for me yet and I don't see it as an issue."