In his worst season since 2001, Roger Federer claimed only one title in 2012, unable to fight against Rafael Nadal, Novak Djokovic and Andy Murray. Ready to make radical changes, Roger started to play with the bigger racquet frame and called for new faces in his box, contacting one of his idols Stefan Edberg.
The Swede went to Dubai with Roger for a week, they got to know each other and the chemistry was born. With Stefan by his side, Federer reached the semi-final at the Australian Open in 2014 before winning the first title together in Dubai.
The Swiss was the finalist in Indian Wells and Monte Carlo, defending his title in Halle and advancing into the final at Wimbledon. He lost it to Novak Djokovic in five thrilling sets, missing a chance to add another Major trophy to his cabinet.
By the end of the season, Federer conquered Cincinnati, Shanghai and Basel, backed by the semi-final at the US Open and the title match at the ATP Finals that he had to skip due to a back injury. For the first time in three years, Federer won six ATP titles in 2015, including Brisbane, Dubai, Istanbul, Halle, Cincinnati and Basel.
Like in the previous season, Roger was sharp and aggressive, rushing to the net and keeping the points on his racquet as much as possible. At the end of the year, Roger and Stefan decided to end the partnership that was supposed to last only for a year, saying great things about each other.
Edberg said it was an honor to coach Roger Federer, praising the Swiss and his tennis knowledge.
Also, the Swede highlighted the changes they had made in his game, which helped him stay competitive up to date.
"It was an honor to be asked to coach Roger Federer," Edberg told Mats Wilander on Eurosport.
"It took me some time to decide. We spent a week in Dubai just to get to know each other before going on the tour. To summarise things, it was great to be around Roger, we talked about tennis, about strategy and he's such an ambassador for tennis.
He wanted to change his game and that was maybe part of the reason he took me in to get a few ideas. He knows so much about tennis and there's not much you can teach him; he knows pretty much everything on the court. It was nice to get somebody else who has been in the same position, being in the finals and trying to change the game.
Once you get older, you maybe need to change your game, and that is what we worked a lot on. I think the great thing, looking back, was he switched racquet to more of a modern one - that was the key. He changed his game a little bit; his movement got a bit more aggressive, which I think he needed to do. It worked out very well - it was good to be around."