He may have won the jackpot, but he was actually lucky on two counts.
Firstly Robert Fidler is $5 Million better off, but he was also lucky not to have shared the jackpot with a bunch of other winners.
Lots of players use birthday lottery numbers – i.e. they pick numbers according to family birthdays. Which means an awful lot of people use the numbers 1-31 (days), with an even larger number choosing the numbers 1-12 (and months!).
And lots of players picking numbers the same way, means a much greater chance of having to share the jackpot if those numbers come up.
Actually he triply lucky, as poor Robert was so shocked to find he had won he thought he was going to end up in hospital.