Question: Did Kevin Ullyett and Frederik Nielsen play in men's singles?

Context paragraphs:
Frederik Nielsen: Frederik Løchte Nielsen (born 27 August 1983) is a professional male tennis player.  He is a former Wimbledon Men's Doubles champion, in 2012, and now competes mainly on the ATP Challenger Tour in both singles and doubles.  Nielsen is coached by fellow Dane John Larsen and is a member of the Denmark Davis Cup team.  His grandfather is former grand slam finalist Kurt Nielsen.

2002 TD Waterhouse Cup – Doubles: At the 2002 TD Waterhouse Cup – Doubles, Jonathan Stark and Kevin Ullyett were the defending champions but only Ullyett competed that year with Robbie Koenig.

1999 Legg Mason Tennis Classic – Doubles: Grant Stafford and Kevin Ullyett were the defending champions.  Stafford chose not to participate this year.  Ullyett partnered with Piet Norval but lost in the semifinals to the eventual champions Justin Gimelstob and Sébastien Lareau.  <BR>Justin Gimelstob and Sébastien Lareau won in the final over David Adams and John-Laffnie de Jager, 7–5, 7–6.

2010 If Stockholm Open – Doubles: Bruno Soares and Kevin Ullyett were the defending champions.  Ullyett retired from professional tennis in 2009.

2013 Wimbledon Championships – Men's Doubles: Jonathan Marray and Frederik Nielsen were the defending champions, but decided not to play together.  Marray played alongside Colin Fleming, but lost to Robert Lindstedt and Daniel Nestor in the third round.  Nielsen paired up with Grigor Dimitrov, but lost to Julien Benneteau and Nenad Zimonjić in the second round.

2012 Wimbledon Championships – Men's Doubles: Bob Bryan and Mike Bryan were the defending champions, but lost to wildcards Jonathan Marray and Frederik Nielsen in the semifinals.  Marray and Nielsen won the title defeating fifth seeded Robert Lindstedt and Horia Tecău who competed in their third consecutive Wimbledon final.  Marray became the first British player to win the men's doubles at Wimbledon since Pat Hughes and Raymond Tuckey in 1936.  Nielsen is only the second Danish winner of a Grand Slam title, following his own grandfather, Kurt Nielsen, who won the mixed doubles at the 1957 U.S. National Championships.

2009 If Stockholm Open – Doubles: Jonas Björkman and Kevin Ullyett were the defending champion, but Björkman was retired in November 2008. Ullyett partnered up with Bruno Soares, and they won in the final 6–4, 7–6 against Simon Aspelin and Paul Hanley.

Kevin Ullyett: Kevin Ullyett (born 23 May 1972 in Salisbury, now Harare) is a former professional tennis player from Zimbabwe.  His primary success on the tour was in men's doubles.

2006 Rogers Masters – Doubles: Wayne Black and Kevin Ullyett were the defending champions, but Black retired in 2006, and only Ullyett competed that year.

2016 Tiburon Challenger – Doubles: Johan Brunström and Frederik Nielsen were the defending champions but only Nielsen chose to defend his title, partnering Noah Rubin.  Nielsen lost in the first round to Blaž Rola and Grega Žemlja.

Supporting paragraphs: Frederik Nielsen Kevin Ullyett
Answer: no