Top seed Agnieszka Radwanska's title defence at the Sydney International lasted just 92 minutes when she was dumped out of the second round by Bethanie Mattek-Sands on Tuesday.
Images from all the action on Day 4 of the Australian Open in Melbourne on Thursday
The British number one will play Croatian Donna Vekic, 7-6(5), 3-6, 7-6(4) victor over Czech Lucie Safarova in the day's second semi-final, in the climax to the Wimbledon warm-up tournament on Sunday.
A day after celebrating his 36th birthday, Federer played the aggressive game that has propelled him to five titles, including two grand slams, this year, attacking the net and rocketing second serves.
Rafael Nadal easily avoided the embarrassment of a back-to-back first round exits at the Australian Open on Tuesday, ramping up his serve and rattling off 39 winners to beat Florian Mayer 6-3, 6-4, 6-1 on Rod Laver Arena.
The signs that things were going horribly wrong for Roger Federer were laid bare at Roland Garros.
A summary of the matches from Day 9 at the French Open.
Defending champion Novak Djokovic moved confidently into the second round of Wimbledon with a 6-4, 6-4, 6-4 win over German Philipp Kohlschreiber on Monday.
Dani Alves has blamed the media for Brazil's unsuccessful World Cup campaign but conceded that the team did not prepare properly ahead of the humiliating 7-1 defeat by Germany in the semi-final.