Ms Saffiotti went into the poll with a clear 4.1 per cent advantage, but a statewide swing of 8.8 per cent revealed soon after polls closed appeared to put the safe Labor seat in jeopardy.
But Ms Saffiotti, who campaigned heavily on local infrastructure and transportation issues, including an Ellenbrook rail line, the dualling of Gnangara Road, a rapid transit bus service and a new public pool for Ellenbrook, shrugged off the trend.
She easily retained the seat with a 4.8 per cent buffer over Liberal candidate Natasha Cheung under the two-party preferred system.
Liberal candidate Frank Alban recorded a comfortable win over Labor rival Ian Radisich to retain his seat of Swan Hills.
The large swing to the Liberals resulted in Mr Alban boosting his vote to 55.1 per cent under the two-party preferred system ” up from 53.5 per cent in 2008, giving him a 10.2 per cent margin.
In Moore, Nationals candidate Shane Love shrugged off a challenge from the Liberals’ Chris Wilkins to win the conservative seat.
Mr Love built on the large two-party preferred margin already held in the seat by retiring Nationals member Grant Woodhams, to record 57 per cent under the preferred margin system ” a massive 14 points ahead of Mr Wilkins.
Midland remains on a knife-edge, with the final result unlikely to be known until at least Friday.
Labor Party incumbent Michelle Roberts has held the seat since 1996 and seemed to hold a comfortable margin of 8.5 per cent leading into the election.
But when votes were tallied after the polls closed, little separated Ms Roberts and Liberal candidate Daniel Parasiliti, with the final result too close to call.
Under the two-party preferred system, Ms Roberts held a slender margin of just 142 votes ” 8828 to Mr Parasiliti’s 8686.
The final result was not likely to be known until after final postal votes and election preferences were fully taken into account, a WA Electoral Commission spokesman said.