It's raw power and 15 Grand Slam titles against consistency and one Grand Slam final defeat in the French Open semifinals on Thursday when Serena Williams goes up against Sara Errani.
Roger Federer will call upon the golden memory of his Grand Slam breakthrough at Wimbledon 10 years ago to fuel his belief that he is still a contender in the majors.
A shot fired straight into Roger Federer's armpit demonstrated just how badly Jo-Wilfried Tsonga wanted to reach the French Open semifinals.
All Rafael Nadal wanted for his 27th birthday at the French Open on Monday was his forehand back and he got his wish as the Spaniard's most feared weapon demolished Japan's Kei Nishikori and sent the defending champion into the quarter-finals.
Ask her to describe the way she plays and Serena Williams has a one-word response - fierce.
Second seed Roger Federer produced a thrilling riposte to Gilles Simon's gallant attempt to knock him out of the French Open on Sunday to claim a 6-1 4-6 2-6 6-2 6-3 victory in front of a raucous late-evening crowd on Philippe Chatrier Court.
If young Americans like Ryan Harrison and Jack Sock are to keep climbing the rankings they will need plenty of the staying power compatriot John Isner demonstrated once again.
Defending champion Rafael Nadal survived an early scare in the second round to beat Martin Klizan while second seed Roger Federer reached the last 16 with an easy win over 30th seed Julien Benneteau.
Zheng Jie of China becomes the only hope of Chinese contigent at the French Open as Li Na and her counterpart Peng Shuai both failed to advance into the third round on Thursday.
Asia's first Grand Slam singles champion Li Na was bundled out of the French Open by American Bethanie Mattek-Sands on Thursday, losing a rain-interrupted match 5-7 6-3 6-2.
Sixth seed and former champion Li Na of China became the biggest name to fall at the French Open as she was knocked out by Bethanie Mattek-Sands in the second round on Thursday.
Peng Shuai defeated Camila Giorgi 6-4, 6-2 at the first round of the French Open.