Open Era. He went on to lose the final to Djokovic, this time in three sets. Murray added Jonas Björkman to his coaching staff in March initially on a five-week trial to help out in periods when Mauresmo was unavailable as she only agreed to work with him for 25 weeks. However, at the end of the Australian Open, Mauresmo had informed Murray that she was pregnant and he announced at the end of April, that Björkman would be his main coach for all of the grass court season and all of the US hard court swing, while Mauresmo would only be with the team for Wimbledon. Murray won his first ATP clay court title at the 2015 BMW Open. He defeated German Philipp Kohlschreiber in three close sets to become the first Briton since Buster Mottram in 1976 to win a tour level clay court event. The following week he reached his second final on clay, at the Madrid Open after recording only his second and third victories over top 10 opposition on clay, against Raonic and Nishikori. In the final, he defeated Rafael Nadal in straight sets for his first Madrid title on clay, and first ever clay court Masters 1000 title. The win was Murray's first over Nadal, Federer or Djokovic since Wimbledon 2013, and his first over Nadal on a clay court. Murray continued his winning streak at the Italian Open, beating Jeremy Chardy in straight sets in his opening match, but then withdrew due to fatigue after having played nine matches in the space of 10 days. Murray then reached his third semi-final at the French Open, but lost to Djokovic in five sets after threatening a comeback from two sets to love down, ending his 15 match winning streak on clay. To start his grass court campaign, Murray went on to win a record-tying fourth Queen's Club title, defeating the big serving South African Kevin Anderson in straight sets in the final. At the third grand slam of the year, the 2015 Wimbledon Championships, Murray dropped only two sets on his way to setting up a semi-final clash with Roger Federer. Murray lost to the Swiss veteran in straight sets, gaining only one break point in the entire match. After Wimbledon, Murray returned to Queen's Club, to play for Great Britain against France in their Davis Cup quarter-final tie. Great Britain went 1–0 down