Here are my predictions for the 2011 Australian Open men's semifinals. I had previously correctly predicted 2 of 4 men's quarterfinals. You can also see my predictions for the women's semifinals and women's quarterfinals (3 of 4 right).
Murray had a more sedate 33 winners and 34 errors and won the final set 6-3. The drama of the Murray-Dolgopolov quarterfinal was quickly eclipsed when the two Spaniards took the court. After a quick service hold by Ferrer to start the match, Nadal's first service game lasted 17 minutes and consisted of 22 points with 7 deuces. Ferrer was playing very aggressively, especially with his forehand and service return; he was running down shots which would have been winners against almost anyone else. Eventually Ferrer was able to get the break, which he then immediately gave back through strong play by Nadal. On the changeover it became clear something was very wrong with Nadal, and he left the court to take an injury time out and receive treatment. It looked very much like he would retire at various points in the first set after that. Amazingly he had retired in a math played exactly a year before, in the men's quarterfinal of 2010 against Murray, also played on Australia Day, January 26. However, Nadal soldiered on and Ferrer continued his style of aggressive play, taking advantage of Nadal's clearly limited movement to his forehand side (Nadal's left thigh was heavily strapped) and maintained his composure to complete the stunning 6-4 6-2 6-3 straight sets win over the defending Roland Garros, Wimbledon and US Open champion. Rafa's quest to be the first man in a generation (or two) to simultaneously hold all 4 major titles was over. The reason I have spent so much time reviewing the quarterfinal matches instead of previewing the semifinal match is because there is not much to say. Head-to-head Ferrer and Murray have met 5 times, (never in a Grand Slam) with Murray winning all their hard court matches relatively easily and Ferrer winning the clay court matches. Murray was able to reach the final last year, and he is playing even better one year later. Ferrer is also playing better, but, barring an injury, the result of their next hard court match will not be any different from the other three they have played before. PREDICTION: Murray in 4 sets. Roger Federer SUI (2). vs. Novak Djokovic SRB (3). This semifinal match-up is a reprise of the four celebrated grand slam semifinals these two have competed: the 2010 US Open semifinal won by Djokovic after saving two match points in the 5th set; the 2009 US Open semifinal won by Federer which featured the amazing tweener shot by the Swiss great on the penultimate point of the match; the 2008 US Open semifinal won in straight sets by Federer despite trailing in the first two; and the 2008 Australian Open semifinal won by Djokovic on his way to winning his first major title. 
So, despite Federer's impressive 13-6 head-to-head edge overall, the two have actually split the four hard-court major semifinals they have played in their careers. Bizarrely, they have never played at Wimbledon or at Roland Garros. It should be noted that Federer has won the last three times they have played, and has apparently taken energy from his defeat in New York last year. Djokovic is also playing inspired tennis, having achieved one of his career goals by anchoring his country to a Davis Cup title (something Federer has not done despite having someone as talented as Stan Wawrinka on his team). Of the four players left remaining in the tournament, Djokovic and Murray have both only dropped one tie-break set each. Djokovic in particular has looked the most impressive, taking out the #6 (Tomas Berdych), #14(Nicolas Almagro) and #29 seeds.
The highest seed that Federer has had to face was Wawrinka at #19 but Gilles Simon in the first round was playing like a Top 10 player when he stretched the World #2 to 5 sets. To determine my pick, I'm going to try an do some math. There are three possibilities, which I will assume are equally likely to occur (3-set, 4-set and 5-set match with 33% probabilities). If only 3 sets of tennis are played I give Federer a 25-8 edge. In a 4-set match I give Djokovic a 17-16 edge. In a 5-set match I give Djokovic a 25-8 edge. So overall, Djokovic has a 50-49 edge. I split the last point equally and this gets Djokovic slightly ahead to reach his second Australian Open final, and second consecutive major final. PREDICTION: Djokovic (has a 50.5% chance to win).
So, despite Federer's impressive 13-6 head-to-head edge overall, the two have actually split the four hard-court major semifinals they have played in their careers. Bizarrely, they have never played at Wimbledon or at Roland Garros. It should be noted that Federer has won the last three times they have played, and has apparently taken energy from his defeat in New York last year. Djokovic is also playing inspired tennis, having achieved one of his career goals by anchoring his country to a Davis Cup title (something Federer has not done despite having someone as talented as Stan Wawrinka on his team). Of the four players left remaining in the tournament, Djokovic and Murray have both only dropped one tie-break set each. Djokovic in particular has looked the most impressive, taking out the #6 (Tomas Berdych), #14(Nicolas Almagro) and #29 seeds. 
The highest seed that Federer has had to face was Wawrinka at #19 but Gilles Simon in the first round was playing like a Top 10 player when he stretched the World #2 to 5 sets. To determine my pick, I'm going to try an do some math. There are three possibilities, which I will assume are equally likely to occur (3-set, 4-set and 5-set match with 33% probabilities). If only 3 sets of tennis are played I give Federer a 25-8 edge. In a 4-set match I give Djokovic a 17-16 edge. In a 5-set match I give Djokovic a 25-8 edge. So overall, Djokovic has a 50-49 edge. I split the last point equally and this gets Djokovic slightly ahead to reach his second Australian Open final, and second consecutive major final. PREDICTION: Djokovic (has a 50.5% chance to win). 
