MELBOURNE, Australia — Rafael Nadal has joined Roger Federer on the sidelines at the Australian Open, taking their combined 31 Grand Slam singles titles with them. On the women's side, second-seeded Maria Sharapova, who beat Eugenie Bouchard on Tuesday, and Ekaterina Makarova are still around and will play an all-Russian semifinal. Nadal's lack of match fitness from nearly six months of injuries and illness finally caught up with the 14-time major champion in his quarterfinal match against Tomas Berdych.