Djokovic, a Monte Carlo resident, was trained by former Slovak tennis player Marian Vajda from 2006 until December 2013, when Boris Becker took over as head coach. Djokovic describes himself as a language enthusiast, speaking Serbian, English, French, German, and Italian. He also plays golf, skateboards, and watches movies. Djokovic has won seven Grand Slam singles titles so far in his career. His latest victory came at the Australian Open 2018 where he defeated Roger Federer in four matches to claim his second Australian Open title. He is the only male player to have won the Australian Open without dropping a single game. Djokovic is also the only man to have achieved this feat twice. The first time was in 2008 when he beat Rafael Nadal and Murray Smith in the final. The last time was in 2018 when he beat Federer in the final again. In total, Djokovic has won 14 Masters 1000 tournaments across all the Grand Slam events. He is the only person other than Rod Laver (who won 16 times) to have reached the top of the world rankings without losing a match. Djokovic's success on the court has helped him become one of the most popular athletes in Serbia. He is loved by Serbs for his polite behavior and excellent skills on the tennis court. However, his popularity has fallen since 2011 when he began to gain weight.