Wales earned this Slam the hard way - by winning at Twickenham for the first time in 20 years and in Dublin for the first time in eight years.

BBC: Six Nations lives up to hype

Winning your first Grand Slam is hard.

BBC: Six Nations: Jeremy Guscott on Ireland v England

But when the 11-time Grand Slam champion heads to the hard courts for an official match later this week at Indian Wells, he doesn't know how his balky knee will respond.

WSJ: Rafael Nadal ready to test knee on hard courts

She was a revelation back then, a hard hitting, screeching, almost reckless ball-basher who did something unthinkable in her first Grand Slam final: She pummeled two-time defending Wimbledon champion Serena Williams.

WSJ: French Open 2012: Maria Sharapova's Time to Shine

Djokovic is 25 and now owns six Grand Slam titles, five of them taken since 2011, and if his body holds, it's hard to imagine him not pushing into double figures in the next few years.

WSJ: Jason Gay: Tennis's Awesome Problem

The world No. 2 had to work hard for victory against Errani, who she defeated in last year's French Open to achieve her career grand slam, having previously won Wimbledon (2004), the U.S. Open (2006) and the Australian Open (2008).

CNN: Sharapova admits Miami Masters dream