Novak Djokovic is a Serbian professional tennis player and former world No. 1 who is currently ranked world No. 2 by the Association of Tennis Professionals. He is generally considered to be one of the greatest tennis players of all time. Djokovic has won six Grand Slam singles titles and has held the No. 1 spot in the ATP rankings for a total of 101 weeks. By winning three Grand Slam titles in 2011, Djokovic became the sixth male player to win three Grand Slams in a calendar year. By reaching the 2012 French Open final, he became the ninth player in the Open Era to reach the final of all four Grand Slam singles tournaments and became only the fifth to do so consecutively. Amongst other titles, he won the Tennis Masters Cup in 2008, 2012 and 2013 and was on the Serbian team which won the 2010 Davis Cup. He also won the Bronze medal in men's singles at the 2008 Summer Olympics. He has won 18 Masters 1000 series titles, breaking a single-season record with five titles in 2011. This places him third on the list of Masters 1000 winners since its inception in 1990. He holds several men's world records of the Open Era: becoming the youngest player in the Open Era to have reached the semifinals of all four Grand Slam events both separately and consecutively; the first and only man to win three consecutive Australian Open titles in the Open Era; and playing the longest Grand Slam men's singles final in history. Djokovic's ATP tournament records include winning 31 consecutive ATP World Tour Masters 1000 series matches, playing in the finals at all nine ATP Masters 1000 tournaments, and being the only player to win eight.