Question: Who had a higher singles ranking, Paul Haarhuis or Katarina Srebotnik?

Context paragraphs:
2016 Aegon International Eastbourne – Doubles: Caroline Garcia and Katarina Srebotnik were the defending champions, but Garcia chose not to participate this year.  Srebotnik played alongside Andreja Klepač, but lost in the first round to Anna-Lena Grönefeld and Květa Peschke.

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.

2014 Aegon International – Women's Doubles: Nadia Petrova and Katarina Srebotnik were the defending champions, but Petrova chose not to participate.  Srebotnik played alongside Květa Peschke, but lost in the semifinals to Martina Hingis and Flavia Pennetta. <br>

2007 French Open – Women's Doubles: The 17th-seeded team of Alicia Molik and Mara Santangelo defeated 7th seeded Katarina Srebotnik and Ai Sugiyama 7–6, 6–3 the women's doubles tennis title.  In the semifinals, Srebotnik and Sugiyama had defeated top seeds and defending champions Lisa Raymond and Samantha Stosur in three sets.

2009 Sony Ericsson Open – Women's Doubles: Katarina Srebotnik and Ai Sugiyama were the defending champions, but Srebotnik chose not to participate this year due to injury.

2009 Kremlin Cup – Women's Doubles: Nadia Petrova and Katarina Srebotnik were the defending champions, but Srebotnik chose to participate at the BGL Luxembourg Open instead.Petrova partnered up with Maria Kirilenko, and they won in the final 6-2, 6-2 against Maria Kondratieva and Klára Zakopalová.

2009 Generali Ladies Linz – Doubles: Katarina Srebotnik and Ai Sugiyama were the defending champions, but Sugiyama retired from the sport on October 2, 2009, and only Srebotnik competed that year.  Srebotnik partnered with Anna-Lena Grönefeld, and they won in the final 6-1, 6-4 against Klaudia Jans and Alicja Rosolska.

2012 China Open – Women's Doubles: Květa Peschke and Katarina Srebotnik were the defending champions, but decided not to play together.  Peschke partnered with Anna-Lena Grönefeld, but lost in the quarterfinals to Maria Kirilenko and Nadia Petrova.  Srebotnik played alongside Zheng Jie, but lost in the semifinals to Nuria Llagostera Vives and Sania Mirza. <br>

Paul Haarhuis: Paul Vincent Nicholas Haarhuis (born 19 February 1966) is a Dutch former professional tennis player.  He is a former World No. 1 doubles player and reached a career-high singles ranking of World No. 18 in November 1995.  He won six Grand Slam men's doubles titles, five with Jacco Eltingh and one with Yevgeny Kafelnikov.

2014 Sony Open Tennis – Women's Doubles: Nadia Petrova and Katarina Srebotnik were the defending champions, but they decided not to participate together.  Petrova was scheduled to play alongside Bethanie Mattek-Sands, but the team withdrew before the first round due to Mattek-Sands's hip injury.  Srebotnik teamed up with Květa Peschke, but they lost in the quarterfinals to Cara Black and Sania Mirza.

Supporting paragraphs: Paul Haarhuis Katarina Srebotnik
Answer: Paul Vincent Nicholas Haarhuis