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ROTTERDAM, Feb 16 (Reuters) - Argentine Juan Martin del Potro is determined to go one step further than his runner-up finish 12 months ago at the World Indoor Tournament as he reached the final with a 6-4 6-4 win over Bulgaria's Grigor Dimitrov on Saturday.

BERLIN, Feb 16 (Reuters) - The International Olympic Committee is planning a conference on the role of the World Anti-Doping Agency (WADA) to improve the drugs in sport watchdog's deteriorating ties with international federations and national Olympic committees.

Feb 16 (Infostrada Sports) - Results from the San Jose Open Men's Singles Quarterfinal matches on Friday 3-Sam Querrey (U.S.) beat Alejandro Falla (Colombia) 6-3 4-6 7-5 1-Milos Raonic (Canada) beat 6-Denis Istomin (Uzbekistan) 7-6(0) 6-3 2-John Isner (U.S.) beat 8-Xavier Malisse (Belgium) 7-6(8) 6-2 4-Tommy Haas (Germany) beat Steve Johnson (U.S.) 6-4 6-2

Feb 16 (Infostrada Sports) - Results from the Brazil Open Men's Singles Quarterfinal matches on Friday 1-Rafa Nadal (Spain) beat Carlos Berlocq (Argentina) 3-6 6-4 6-4 David Nalbandian (Argentina) beat 2-Nicolas Almagro (Spain) 7-6(5) 3-6 7-6(3) Martin Alund (Argentina) beat Filippo Volandri (Italy) 7-5 7-6(5) Simone Bolelli (Italy) beat Albert Montanes (Spain) 6-4 6-4

Feb 15 (Infostrada Sports) - Results from the San Jose Open Men's Singles Quarterfinal matches on Friday 2-John Isner (U.S.) beat 8-Xavier Malisse (Belgium) 7-6(8) 6-2 4-Tommy Haas (Germany) beat Steve Johnson (U.S.) 6-4 6-2

ROTTERDAM, Feb 15 (Reuters) - Defending champion Roger Federer suffered a shock 6-3 7-5 defeat by Frenchman Julien Benneteau, who has yet to lift a tour title during his 13-year career, in the World Indoor Tournament quarter-finals on Friday.

Feb 15 (Infostrada Sports) - Results from the World Indoor Tournament Men's Singles Quarterfinal matches on Friday 5-Gilles Simon (France) beat Martin Klizan (Slovakia) 6-7(6) 6-3 3-0 (Klizan retired) Julien Benneteau (France) beat 1-Roger Federer (Switzerland) 6-3 7-5 2-Juan Martin Del Potro (Argentina) beat Jarkko Nieminen (Finland) 6-3 6-4 Grigor Dimitrov (Bulgaria) beat Marcos Baghdatis (Cyprus) 6-7(4) 7-6(0) 6-3

* Radwanska sets up last four clash with Azarenka (Updates with Radwanska victory)

Feb 15 (Infostrada Sports) - Results from the Brazil Open Men's Singles Quarterfinal matches on Friday David Nalbandian (Argentina) beat 2-Nicolas Almagro (Spain) 7-6(5) 3-6 7-6(3) Martin Alund (Argentina) beat Filippo Volandri (Italy) 7-5 7-6(5) Simone Bolelli (Italy) beat Albert Montanes (Spain) 6-4 6-4

ROTTERDAM, Feb 15 (Reuters) - Defending champion Roger Federer suffered a shock 6-3 7-5 defeat by Frenchman Julien Benneteau, who has yet to lift a tour title during his 13-year career, in the World Indoor Tournament quarter-finals on Friday.

ROTTERDAM, Feb 15 (Reuters) - As arguably the greatest ever tennis player, Roger Federer is urging Olympic officials to back another racket sport by including squash in the programme for the 2020 Games.

* Federer loses in quarter-finals (Recasts after Federer defeat)

LONDON, Feb 15 (Reuters) - Following is a list of the oldest women to be world number one after Serena Williams claimed the top spot aged 31 on Friday Serena Williams (U.S) 31 years, 4 months, 24 days Chris Evert (U.S) 30 years, 11 months, 3 days (Nov 1985) Martina Navratilova (U.S) 30 years, 9 months, 29 days (Aug 1987) Lindsay Davenport (U.S) 29 years, 7 months, 8 days (Jan 2006) Serena Williams 29 years, 0 months, 14 days (Oct 2010) Steffi Graf (Germany) 27 years,

Feb 15 (Infostrada Sports) - Results from the Qatar Open Women's Singles Quarterfinal matches on Friday 4-Agnieszka Radwanska (Poland) beat 10-Caroline Wozniacki (Denmark) 6-2 7-5 2-Serena Williams (U.S.) beat 7-Petra Kvitova (Czech Republic) 3-6 6-3 7-5 1-Victoria Azarenka (Belarus) beat 6-Sara Errani (Italy) 6-2 6-2 3-Maria Sharapova (Russia) beat 8-Samantha Stosur (Australia) 6-2 6-4

DOHA, Feb 15 (Reuters) - Serena Williams showed tennis was not just the domain of teenagers as she climbed back to the top of the world rankings on Friday, becoming the oldest female to hold the coveted position at the age of 31.

ROTTERDAM, Feb 15 (Reuters) - World number seven Juan Martin Del Potro stayed on course for his second successive appearance in the final of the World Indoor Tournament by sweeping aside Finn Jarkko Nieminen 6-3 6-4 on Friday.

Feb 15 (Infostrada Sports) - Results from the San Jose Open Men's Singles Round 2 matches on Thursday 1-Milos Raonic (Canada) beat Michael Russell (U.S.) 6-2 7-5 3-Sam Querrey (U.S.) beat Lleyton Hewitt (Australia) 7-6(6) 1-6 7-6(4) Steve Johnson (U.S.) beat Tim Smyczek (U.S.) 6-3 6-3 8-Xavier Malisse (Belgium) beat Matthew Ebden (Australia) 5-7 7-5 7-6(1) Alejandro Falla (Colombia) beat 7-Marinko Matosevic (Australia) 6-4 6-4 6-Denis Istomin (

Feb 14 (Infostrada Sports) - Results from the San Jose Open Men's Singles Round 2 matches on Thursday 8-Xavier Malisse (Belgium) beat Matthew Ebden (Australia) 5-7 7-5 7-6(1) Alejandro Falla (Colombia) beat 7-Marinko Matosevic (Australia) 6-4 6-4 6-Denis Istomin (Uzbekistan) beat Benjamin Becker (Germany) 6-3 6-7(5) 6-2

Feb 14 (Infostrada Sports) - Results from the Brazil Open Men's Singles Round 2 matches on Thursday 1-Rafa Nadal (Spain) beat Joao Souza (Brazil) 6-3 6-4 David Nalbandian (Argentina) beat Guido Pella (Argentina) 6-4 6-2 Albert Montanes (Spain) beat 7-Pablo Andujar (Spain) 7-5 6-2 Filippo Volandri (Italy) beat 5-Thomaz Bellucci (Brazil) 6-3 6-2 Carlos Berlocq (Argentina) beat 8-Albert Ramos (Spain) 7-6(7) 6-4 2-Nicolas Almagro (Spain) beat Paul Capdevil

ROTTERDAM, Feb 14 (Reuters) - Roger Federer failed to match the accuracy of Cupid's arrow on Valentine's Day but still cruised past Dutchman Thiemo de Bakker 6-3 6-4 in the second round of the World Indoor Tournament on Thursday.