Blues riled by overturned wicket

NSW coach Trevor Bayliss said a ''dangerous precedent'' could be set after umpire Paul Wilson overturned his decision and gave Western Australia centurion Shaun Marsh a second life.

While the controversial incident should not prevent the Blues from securing victory and hosting the Sheffield Shield final, tensions were high at Manuka Oval on Thursday when Wilson changed his mind on a leg before wicket appeal from Nathan Lyon.

Marsh raised his bat to indicate he had edged the ball and, moments later, Wilson crossed his arms and reversed the original decision.

The normally-reserved Lyon was incensed, engaging in discussions with Wilson as most of the NSW players demonstrated their frustration.

Marsh was on 100 at the time, and made only 13 more runs before he was eventually dismissed.

Bayliss, who played nine seasons of first-class cricket with NSW from 1985-93 and has extensive experience as a coach, said he could not remember an umpire overturning his own decision.

"It was the first time I've ever seen it,'' Bayliss said.

''Whether it was out or not out, it probably sets a dangerous precedent.

''He's turned it over because he thought it was out, or Shaun showed them the bat, it's a difficult one.

''From our point of view, hopefully it doesn't make much of a difference.''

Marsh was relieved the correct decision was eventually made and was adamant he hit the ball.

"It was something a bit different out there,'' Marsh said.

''Full credit to Paul Wilson, who had the guts to call me back and I guess the right decision was made. He knew he made a mistake straight away.''

The Blues are marginally in front, needing another 111 runs to win with eight wickets in hand.

Test batsman Steve Smith will resume on Friday on 32 alongside the experienced Ben Rohrer (nine), with NSW 2-103.

Whichever side wins will host the final, South Australia bowing out of contention after an embarrassing innings and 316-run loss to Tasmania.

Queensland can still make the decider with an outright victory against Victoria, which is 0-109 in its second innings and trails by 164 runs.

WA can thank Marsh for keeping it in the contest.

Marsh was the mainstay of WA's second innings of 316, a huge improvement from its pitiful display of 82 in the first dig.

His terrific knock of 113 came from 246 balls, showing plenty of poise and patience on a difficult batting deck and a slow outfield where no other batsman has made more than 48.

Marsh also battled his own demons after three straight ducks, including back-to-back failures in the second Test against South Africa and the first innings of this match.

For all his composure and reserved play, Marsh's emotions were on full display when he brought up three figures with a mighty six off Lyon straight down the ground.

"It's right up there,'' Marsh said of his century.

"It was just nice to get runs for the WA boys.

"It was a big innings for the team and to put us in a winning position today.''

Bayliss said the Blues would not get ahead of themselves with a tricky run chase still to go on the final day.

"We might just have our noses in front, but it's a fourth-day wicket and we still have 111 to get,'' he said.

"It's a case of getting in and having to make a big score.''

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