 Complete the following phrase:  Originally coached by his mother Judy alongside his older brother Jamie, Murray moved to Barcelona at age 15 to train at the Sánchez-Casal Academy. He began his professional career around the time Roger Federer and Rafael Nadal established themselves as the two domit players in mens tennis. Murray had immediate success on the ATP Tour, making his top 10 debut in 2007 at age 19. By 2010, Murray and Novak Djokovic had separated themselves from the rest of mens tennis, joining Federer and Nadal in the Big Four, the group of players who dominated mens tennis during the 2010s. Murray initially struggled against the rest of the Big Four, losing his first four Grand Slam finals  three to Federer and one to Djokovic. He made his major breakthrough in 2012 by defeating Djokovic to win the US Open. With this title, he became the first British Grand Slam singles champion since Virginia Wade in 1977, and the first male champion since Fred Perry in 1936. A month earlier, he won the mens singles gold medal against Federer at the 