Andy Murray splits with coach Amelie Mauresmo

Andy Murrayhas split from his coach Amelie Mauresmo,ending a groundbreaking two-year relationship during which the British star improved as a clay-court player but failed to add to his collection of Grand Slam titles.

A statement released by Murray's management company didn't disclose the reason behind the decision, although Mauresmo, a former women's world No. 1, said "dedicating enough time along with the travel has been a challenge for me.''

The Frenchwoman gave birth to her first child in August and took six months off from coaching.

She was in Spain as Murray lost theMadrid Open final to Novak Djokovicon Sunday, but his new assistant coach,Jamie Delgado,took charge off the court.

"Working with Andy over the last two years has been a fantastic experience for me," said Mauresmo, who won the Australian Open and Wimbledon in 2006. "I've thoroughly enjoyed being part of the great team of people he has around him."

Murray became the first high-profile tennis player to hire a woman as a coach when he brought Mauresmo on board in June 2014.

By that time, he was already a two-time Grand Slam champion -- at the US Open in 2012 and Wimbledon in 2013 -- and had also won a gold medal at the London Olympics in 2012.

Under Mauresmo, Murray reached the final at the Australian Open in 2015 and '16, losing both times to top-ranked Djokovic. He won his first clay-court titles last year in Munich and Madrid.

"I've learned a lot from Amelie over the last two years, both on and off the court,'' Murray said in the statement. "She's been a calming influence in the team and we will all miss having her around.''

Murray felt the need to dismiss rumors of a fallout with Mauresmo in March after a three-set loss to Grigor Dimitrov at the Miami Open sparked speculation all may not be well between them.

Their partnership was also temporarily broken when the former women's world No. 1 took a break from coaching Murray after Wimbledon last year to give birth to her first child; Jonas Bjorkman, then an assistant on the world No. 3's coaching team, took the reins.

Bjorkman and Murray parted ways in December, however, with two-time Grand Slam winner Mauresmo returning ahead of the Australian Open.

Murray is heading into a busy period of the season, with the French Open, Wimbledon, Rio de Janeiro Olympics and US Open all in the next four months.

"I'll take some time to consider the next steps and how we progress from here," Murray said, "but I'd like to thank her for everything she has done. She's been an invaluable member of the team."

Information from The Associated Press was used in this report.