Table:
text: Friends Life t20
Centuries in the Friends Life t20
Centuries in the Friends Life t20
Rank_ Player Team Runs Balls Year_ Against
1 Kevin O`Brien Gloucestershire Gladiators 119 52 2011 Middlesex Panthers
2 Matt Prior Sussex Sharks 117 55 2010 Glamorgan Dragons
3 Wes Durston Derbyshire Falcons 111 59 2010 Nottinghamshire Outlaws
4 Richard Levi Northamptonshire Steelbacks 110 * 62 2013 Glamorgan
5 Marcus Trescothick Somerset 108 * 61 2011 Essex Eagles
6 Michael Klinger Gloucestershire Gladiators 108 * 64 2013 Worcestershire Royals
7 James Hildreth Somerset 107 * 60 2012 Welsh Dragons
8 Scott Styris Essex Eagles 106 * 50 2010 Surrey
9 Azhar Mahmood Kent Spitfires 106 * 57 2011 Gloucestershire Gladiators

Question: Which Centuries in the Friends Life t20 player had 50 balls?