(CNN) -- Roger Federer may have given up his No. 1 ranking, but the Swiss tennis star's grip on end-of-season supremacy is showing no signs of loosening. 

Federer marched into the semifinals of the $5.5 million ATP World Tour Finals on Thursday, beating in-form Spaniard David Ferrer 6-4 7-6 (7-5) for his second successive straight-sets win in Group B. 

The 31-year-old has not lost at the eight-man London showpiece since 2009, and has now won 70 matches this year -- a feat he had not achieved since 2006 when he was at the peak of his powers. 

"This is a very special tournament in many ways," said Federer, who has reached the last four in 10 of his 11 appearances. 

"It's always been the tournament I wanted to be part of when I started playing at the beginning of the year, many years now. I had breakthrough results at this event. I learned a lot. 

"I've loved everywhere I've played over the years at the World Tour Finals. But I think this one is obviously special, because it's in London and The O2 is an amazing venue. I'm happy it's going to stay here for the next few years." 

The 17-time grand slam champion relinquished the year-end top spot to Novak Djokovic when he decided not to defend his Paris title last week, having pushed his record tally to 302 weeks at the top. 

Fifth-ranked Ferrer took advantage of a weakened field and shock defeats for Djokovic and No. 3 Andy Murray by winning his first Masters level tournament, following up his title in Valencia.  QUESTIONS:

Q1:
1. What is Roger Federer's age?
2. What age is Roger Federer?
3. 
Q2:
1. How many matches have been won by Roger Federer this year?
2. This year has seen how many matches won by Roger Federer?
3. 
Q3:
1. In what year did Roger Federer lose the London showpiece for the last time?
2. When is the last time that Roger Federer lost the London showpiece?
3. 
Q4:
1. When did Roger Federer last have 70 wins in a single year?
2. When was the last time that Roger Federer managed to win 70 tennis matches in a year?
3. 
Q5:
1. Does Roger Federer usually play well at the London showpiece?
2. Is the London Showpiece usually a place where Roger Federer plays well?
3. 
Q6:
1. Is Roger Federer happy about the venue for the London showpiece this year?
2. Does this year's venue for the London showpiece make Roger Federer happy?
3. 
Q7:
1. What is the venue for this year's London showpiece?
2. Where will this year's London showpiece be held?
3. 
Q8:
1. Roger Federer held the number one ranking for how many weeks?
2. For how many weeks was Roger Federer the number one ranked player in the world?
3. 
Q9:
1. Is Roger Federer currently the number one ranked tennis player in the world?
2. Does Roger Federer currently hold the number one spot in the world tennis rankings?
3. 
Q10:
1. What is the name of the tennis player that is currently ranked number one in the world?
2. The number one spot in the world tennis rankings is currently held by which person?
3. 
Q11:
1. What is the current rank of Roger Federer?
2. What ranking does Roger Federer currently hold?
3. 
Q12:
1. What is the name of the country represented by Roger Federer?
2. Roger Federer is representing which country?
3. 
Q13:
1. What is the name of the Spaniard that was beaten by Roger Federer on Thursday?
2. Which Spaniard did Roger Federer beat on Thursday?
3. 
