Question: Which of the following ranked 20 on the Sony Ericsson WTA Tour for tennis: Katarina Srebotnik or Ray Ruffels?

Context paragraphs:
2007 WTA Tour: The 2007 Sony Ericsson WTA Tour was the elite professional tennis circuit organized by the Women's Tennis Association (WTA) for the 2007 tennis season.  The calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the WTA Tier I-IV Events, the Fed Cup (organized by the ITF) and the year-end championships.

2008 WTA Tour: The 2008 Sony Ericsson WTA Tour was the elite professional tennis circuit organized by the Women's Tennis Association (WTA) for the 2008 tennis season.  The 2008 WTA Tour calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the WTA Tier I-IV Events, the Fed Cup (organized by the ITF), the year-end championships, and the tennis event at the Beijing Summer Olympic Games.

Ray Ruffels: Raymond Owen "Ray" Ruffels (born 23 March 1946 in Sydney) is an Australian former professional tennis player and coach.

Sony Ericsson K800i: The Sony Ericsson K800i, and its variant, the Sony Ericsson K790, are mobile phone handsets manufactured by Sony Ericsson.  Launched in July 2006 (for the K800i in the UK market; others may vary), the phones are the successor to the Sony Ericsson K750i.  Both of the phones feature a 3.2-megapixel digital camera complete with a xenon flash, a protective lens cover, and a new "BestPic" bracketing feature, and are the first to be tagged with the Sony Cyber-shot branding.  The new "BestPic" feature takes 9 full quality snapshots of a subject in quick succession, allowing the user to choose the best shots from them.  On the entertainment front, the phones have a media player supporting MP3, AAC/AAC+/eAAC+ and WMA music files and 3GP/MPEG-4 video files.  The phones also feature a RDS FM radio, and a Memory Stick Micro (M2) slot for expandable solid state memory (up to 16 GB).  The K790/K800 models are also the first Sony Ericsson mobile phones to use ATI's Imageon 2192 graphics engine, which delivers a full 3D gaming graphics for Java and full support for its 3.2-megapixel camera.  It is the phone used by James Bond in the 2006 Casino Royale film.

2008 WTA Tour Championships: The 2008 WTA Tour Championships (also known as the "Sony Ericsson WTA Tour Championships" for sponsorship reasons) was a tennis tournament played on outdoor hard courts.  It was the 38th edition of the year-end singles championships, the 33rd edition of the year-end doubles championships, and is part of the 2008 WTA Tour.  It took place at the Khalifa International Tennis Complex in Doha, Qatar, from November 4 through November 9, 2008.

2007 WTA Tour Championships: The 2007 WTA Tour Championships, officially Sony Ericsson Championships, is the thirty seventh season-ending WTA Tour Championships, the annual tennis tournament for the eight best female tennis players in singles, and four teams in doubles, on the 2007 WTA Tour.  It was held from 6 November though 11 November 2007, in Madrid, Spain.

2012 Sony Ericsson Open – Men's Singles: The 2012 Sony Ericsson Open was a tennis tournament played at Key Biscayne, Miami, Florida from March 19 to April 1, 2012.  It was the 28th edition of the Sony Ericsson Open and was played on hard courts at the Tennis Center at Crandon Park.  The event was part of the 2012 ATP World Tour and 2012 WTA Tour.  Novak Djokovic was the defending champion, and successfully defended his title by defeating Andy Murray 6–1, 7–6 in the final.  It was Djokovic's third Sony Ericsson Open title.

2009 Copa Sony Ericsson Colsanitas: The 2009 Copa Sony Ericsson Colsanitas was a tennis tournament played on outdoor clay courts.  It was the 12th edition of the Copa Sony Ericsson Colsanitas, and was on the International category of the 2009 WTA Tour.  It took place at the Club Campestre El Rancho in Bogotá, Colombia, from February 14 through February 22, 2009.  This was the first year it was sponsored by Sony Ericsson.

Rossana de los Ríos: Rossana de los Ríos (born 16 September 1975) is a retired professional tennis player from Paraguay.  She was born in the Paraguayan capital, Asunción, and now lives in Miami, USA, with her daughter Ana Paula Neffa de los Ríos and her husband Gustavo Neffa, a retired Paraguayan Association football player who played for Boca Juniors.  Rossana achieved a career high singles ranking of No. 51 on 12 September 2001, and No. 52 in doubles on the Sony Ericsson WTA Tour.  De los Ríos played doubles with Grand Slam champions such as Maria Sharapova, Svetlana Kuznetsova, Arantxa Sánchez Vicario, as well as Jelena Janković and Dinara Safina.  Rossana is also a former world number one Junior player, having won the 1992 Roland Garros Juniors event.  De los Ríos participated in six editions (1994, 2001, 2002, 2003, 2009 and 2010) of the Australian Open.  She was the only female tennis representative for Paraguay in the 1992 and 2000 Olympic Games.

Katarina Srebotnik: Katarina Srebotnik (born March 12, 1981) is a Slovenian professional tennis player.  She reached a career-high singles ranking of No. 20 on the Sony Ericsson WTA Tour on August 7, 2006, and a career-high doubles ranking of No. 1 on July 4, 2011.

Supporting paragraphs: Katarina Srebotnik Ray Ruffels
Answer: Katarina Srebotnik