Facts About French Open

• The top men's seed has won the title on just 13 occasions in the 47 Roland Garros tournaments played since 1968. This is the least successful performance by the top seed at any of the Grand Slam events. The number one seed has won the title at Roland Garros on just two occasions in the last 13 years, with Rafael Nadal triumphing in 2011 and 2014.

• At 36 years, 192 days Radek Stepanek is the oldest man in the men's singles draw this year, while US wild card Frances Tiafoe, aged 17 years, 138 days, is the youngest. Tiafoe is one of seven teenagers to start the men's main draw -- the highest number of teenagers at Roland Garros since 2007.

• Roger Federer is playing in his 64th Grand Slam event at 2015 Roland Garros. In the absence of Lleyton Hewitt in Paris, he takes sole occupancy of second place for the most Grand Slams played in the Open Era. France's Fabrice Santoro holds the record with 70.

•  World number one Serena Williams has only lost in the first round of a Grand Slam once -- against Virginie Razzano at the French Open in 2012. The American has won her other 58 first round matches at the majors.

• Maria Sharapova has played the most matches (60) at Roland Garros among active women players.