Ivan Lendl has coached Andy Murray to the 2012 U.S. Open and 2013 Wimbledon crowns but their partnership ended last March over dinner.

Now, Lendl has opened up about their split citing extra family commitments and the difficulty of matching the emotional high of the Briton's grand slam breakthroughs as the reasons for the estrangement. But aside from this, Lendl refused to divulge further on the reason.

However, just before the US Open in which Murray will defend his third grand slam title under his coach Frenchwoman Amelie Mauresmo, Lendl said that he had lesser time to spend with his former client due to changes in his personal life.

He said "It was lots of little things combined. Like playing more on the vets tour, and one of my daughters returned home. The youngest one is 16 and she had been away at horse riding school and but now she has come back to live with us. My mum is now 79 and lives in Prague, I need to go more to the Czech Republic than I used to."

He added "The planes are a pain in the arse. The places, the hotels - England was good, Australia was good, here it was alright. It was the smaller trips I didn't like. All these things combined. And you know with Andy, after his surgery and after winning Wimbledon and all that, I felt that if anything he needed more time rather than less time."

Although people saw the Lendl-Murray tandem as awkward, they had proved the odds and had guided Murray to an Olympic gold medal for Team GB at the London Games. The win ended Britain's 77-year wait for a men's champion at the home grand slam.

When Lendl was asked whether the challenge of matching the win also had to do with his decision to part ways he said "Yeah, and that too. "Everyone is different, and when you win a big tournament like Wimbledon, it' not easy sometimes. Some people find it more difficult than others, and I'm glad Andy found Amelie (Mauresmo) who can give him the time he needs."