Last month, Andy Murray made a bold decision when he chose Amelie Mauresmo over the backroom staff who had served him so well in recent years; he may now live to regret that decision.
Dani Vallverdu worked with Murray, as an assistant, throughout the glory years where he won his two Grand Slam titles, but the Venezuelan has now opted to work with one of his former clients main rivals, Tomas Berdych, following their split. Moreover, it marks a step up from assistant to head coach.
Berdych is just one place below Murray in the world rankings, and the no.7 has been looking for a new coach ever since splitting with Tomas Krupka. The Czechoslovakian player initially tried to nab another one of the Briton's former great assets, but Ivan Lendl turned down his offer in the Autumn.
Clearly impressed with Murray's set-up with Lendl and Vallverdu, Berdych has now managed to land the latter. The 2015 season will now have added intrigue; seeing how the two players progress will be a fascinating prospect, especially when you consider how this change came about.
Murray disposed of Vallverdu, a great friend of his, along with trainer Jez Green, following months of speculation that suggested his camp weren't quite playing happy families ever since Mauresmo was chosen to replace Lendl.
Rumours state that Vallverdu, along with other members of back room staff, was kept in the dark over the landmark appointment of the female coach. An angry tirade by Murray towards his team at Wimbledon did little to quell such fears.
Following a wholly unsatisfactory season, with a particularly poor ending at the ATP World Tour Finals, the 27-year-old was expected to make changes, but shocked many as he elected to give Mauresmo another chance, despite a lack of progress.
It's seems like a foolish move by the former world no.3, he has almost completely disposed of those who helped make him great whilst continuing his current regime despite a string of inept displays.
Murray has only himself to blame if Berdych can finally now display the promise that he has threatened throughout the years. His rival came closest to winning a maiden Grand Slam in 2010, where he lost to Rafael Nadal in the Wimbledon final.
Berdych's partnership with Vallverdu has a fantastic chance to blossom - just look at the impact he helped have on the Brit, who, after a number of near misses, finally got over his Grand Slam final hoodoo and won the US Open in 2012, followed by Wimbledon a year later.
Will Murray regret his decision? - We'll have a first chance to see when the new season, headlined by the Australian Open, opens up after Christmas - you wouldn't want to bet against it though.