Lleyton Hewitt's 5-set record is 31-19 (a 62 winning percentage):
1998 Australian Open R128: Daniel Vacek def. Lleyton Hewitt (6-2, 6-4, 1-6, 2-6, 6-3)
1999 French Open R128: Martin Rodriguez def. Lleyton Hewitt (4-6, 6-4, 6-4, 4-6, 6-4)
1999 US Open R32: Andrei Medvedev def. Lleyton Hewitt (3-6, 6-3, 3-6, 6-4, 6-3)
2000 French Open R64: Lleyton Hewitt def. Markus Hantschk (2-6, 6-3, 3-6, 6-2, 6-3)
2000 Stuttgart Indoor F: Wayne Ferreira def. Lleyton Hewitt (7-6, 3-6, 6-7, 7-6, 6-2)
2000 Davis Cup F: Lleyton Hewitt def. Albert Costa (3-6, 6-1, 2-6, 6-4, 6-4)
2001 Australian Open R128: Lleyton Hewitt def. Jonas Bjorkman (7-5, 4-6, 2-6, 6-3, 6-2)
2001 Australian Open R32: Carlos Moya def. Lleyton Hewitt (4-6, 6-1, 5-7, 6-2, 7-5)
2001 French Open R16: Lleyton Hewitt def. Guillermo Canas (3-6, 6-7, 6-2, 6-3, 6-3)
2001 Wimbledon R64: Lleyton Hewitt def. Taylor Dent (1-6, 7-5, 6-3, 6-7, 6-3)
2001 Wimbledon R16: Nicolas Escude def. Lleyton Hewitt (4-6, 6-4, 6-3, 4-6, 6-4)
2001 US Open R64: Lleyton Hewitt def. James Blake (6-4, 3-6, 2-6, 6-3, 6-0)
2001 US Open QF: Lleyton Hewitt def. Andy Roddick (6-7, 6-3, 6-4, 3-6, 6-4)
2001 Davis Cup F: Nicolas Escude def. Lleyton Hewitt (4-6, 6-3, 3-6, 6-3, 6-4)
2002 Wimbledon QF: Lleyton Hewitt def. Sjeng Schalken (6-2, 6-2, 6-7, 1-6, 7-5)
2002 US Open R32: Lleyton Hewitt def. James Blake (6-7, 6-3, 6-4, 3-6, 6-3)
2002 Masters Cup F: Lleyton Hewitt def. Juan Carlos Ferrero (7-5, 7-5, 2-6, 2-6, 6-4)
2003 Australian Open R128: Lleyton Hewitt def. Magnus Larsson (6-3, 3-6, 6-1, 6-7, 6-2)
2003 French Open R32: Tommy Robredo def. Lleyton Hewitt (4-6, 1-6, 6-3, 6-2, 6-3)
2003 Davis Cup SF: Lleyton Hewitt def. Roger Federer (5-7, 2-6, 7-6, 7-5, 6-1)
2003 Davis Cup F: Lleyton Hewitt def. Juan Carlos Ferrero (3-6, 6-3, 3-6, 7-6, 6-2)
2004 French Open R32: Lleyton Hewitt def. Martin Verkerk (6-2, 3-6, 4-6, 6-2, 6-1)
2005 Australian Open R16: Lleyton Hewitt def. Rafael Nadal (7-5, 3-6, 1-6, 7-6, 6-2)
2005 Australian Open QF: Lleyton Hewitt def. David Nalbandian (6-3, 6-2, 1-6, 3-6, 10-8 )
2005 US Open R32: Lleyton Hewitt def. Taylor Dent (6-3, 3-6, 6-7, 6-2, 7-5)
2005 US Open QF: Lleyton Hewitt def. Jarkko Nieminen (2-6, 6-1, 3-6, 6-3, 6-1)
2006 Australian Open R128: Lleyton Hewitt def. Robin Vik (6-4, 2-6, 5-7, 7-6, 6-3)
2006 Wimbledon R64: Lleyton Hewitt def. Hyung-Taik Lee (6-7, 6-2, 7-6, 6-7, 6-4)
2006 US Open R16: Lleyton Hewitt def. Richard Gasquet (6-4, 6-4, 4-6, 3-6, 6-3)
2006 Davis Cup SF: Jose Acasuso def. Lleyton Hewitt (1-6, 6-4, 4-6, 6-2, 6-1)
2007 Australian Open R128: Lleyton Hewitt def. Michael Russell (3-6, 2-6, 6-3, 6-3, 6-3)
2007 Davis Cup 1R: Kristof Vliegen def. Lleyton Hewitt (4-6, 6-4, 3-6, 6-3, 6-4)
2007 Davis Cup 1R: Lleyton Hewitt def. Olivier Rochus (6-2, 6-3, 6-7, 3-6, 6-1)
2007 French Open R64: Lleyton Hewitt def. Gaston Gaudio (4-6, 3-6, 6-2, 6-4, 6-2)
2007 Davis Cup: Lleyton Hewitt def. Janko Tipsarevic (6-2, 3-6, 4-6, 6-1, 6-1)
2008 Australian Open R32: Lleyton Hewitt def. Marcos Baghdatis (4-6, 7-5, 7-5, 6-7, 6-3)
2008 French Open R32: David Ferrer def. Lleyton Hewitt (6-2, 3-6, 3-6, 6-3, 6-4)
2008 Wimbledon R128: Lleyton Hewitt def. Robin Haase (6-7, 6-3, 6-3, 6-7, 6-2)
2009 Australian Open R128: Fernando Gonzalez def. Lleyton Hewitt (5-7, 6-2, 6-2, 3-6, 6-3)
2009 Davis Cup: Danai Udomchoke def. Lleyton Hewitt (2-6, 4-6, 7-6, 6-4, 6-1)
2009 French Open R128: Lleyton Hewitt def. Ivo Karlovic (6-7, 6-7, 7-6, 6-4, 6-3)
2009 Wimbledon R16: Lleyton Hewitt def. Radek Stepanek (4-6, 2-6, 6-1, 6-2, 6-2)
2009 Wimbledon QF: Andy Roddick def. Lleyton Hewitt (6-3, 6-7, 7-6, 4-6, 6-4)
2010 French Open R64: Lleyton Hewitt def. Denis Istomin (1-6, 6-3, 6-4, 2-6, 6-2)
2010 US Open R128: Paul-Henri Mathieu def. Lleyton Hewitt (6-3, 6-4, 5-7, 4-6, 6-1)
2011 Australian Open R128: David Nalbandian def. Lleyton Hewitt (3-6, 6-4, 3-6, 7-6, 9-7)
2011 Wimbledon R64: Robin Soderling def. Lleyton Hewitt (6-7, 3-6, 7-5, 6-4, 6-4)
2011 Davis Cup: Stanislas Wawrinka def. Lleyton Hewitt (4-6, 6-4, 6-7, 6-4, 6-3)
2012 US Open R64: Lleyton Hewitt def. Gilles Muller (3-6, 7-6, 6-7, 7-5, 6-4)
2013 French Open R128: Gilles Simon def. Lleyton Hewitt (3-6, 1-6, 6-4, 6-1, 7-5)