However, it was easy to forget as she won 17 straight matches on clay, racking up two titles heading into the French Open. She was the clear favorite, just like she was at last year's U.S. Open.

The two will battle it out for a berth in the 2012 French Open final. Djokovic has been struggling at Roland Garros and Federer will take full advantage in an epic semifinal matchup.

The Frenchman, who has also coached Simona Halep and Stefanos Tsitsipas, recently spoke about Serena’s French Open title victory in 2013. On Instagram, Mouratoglou said: “With Serena we started ...