World number one Serena Williams crashed to the joint-heaviest defeat of her career as Simona Halep shocked the 18-time grand slam champion at the WTA Finals in Singapore. Halep prevailed 6-0 6-2 in just 65 minutes to claim the second win of the round robin stage to all but book a place in the semi-final and leave her American opponent reeling.
Williams was broken five times by the number four seed and registered just two games to suffer her worst defeat since the 1998 6-1 6-1 loss to Joannette Kruger.

Source: http://247tops..com/2014/10/serena-williams-suffers-heaviest-defeat.html

In life, you win some you lose sum. heaviest defeat is just a sensational rig. she has done well forr herself

U only hear about a record when it's being or about to be broken and a new one automatically being set. Worst defeat since 1998, that's life. We only heard about it now because she suffered the same loss this year, either ways she's one of the greatest tennis players.