Swede's lead nightmare for Paul Casey
To add to Casey's problems, England's Simon Dyson has moved into joint-second place and he too can oust him from the all-important top nine with a win. It is pretty much the nightmare scenario for Casey, Padraig Harrington, Justin Rose and Luke Donald.
Controversially, not one of them has entered for next week's race-ending Johnnie Walker Championship at Gleneagles, preferring instead the FedEx Cup play-offs in the United States.
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Hide AdThat event carries huge money incentives, but not a single cup point and if Casey does drop out of an automatic qualifying spot, the quartet will all be left hoping for a Ryder Cup wild card - and captain Colin Montgomerie has only three.
Hanson, only given an invite to the Czech Open on Monday, was joint halfway leader with compatriot Fredrik Widmark, but was caught by both Dyson and Spain's Miguel Angel Jimenez early on the back nine.
His response was brilliant. Birdies came on the 13th, 14th, 16th and the 453-yard last - a hole where Australian Tim Stewart had earlier taken 11 - for a four-under-par 68 and 12-under total of 204.