All grind and no glamour, the Silver Ferns wing defence role will come under the microscope when New Zealand meet Australia in the fourth and final Constellation Cup netball Test in Invercargill on Thursday.With Kayla Cullen sidelined for three months following foot surgery, the Silver Ferns have been scrambling to fill what coach Janine Southby describes as a hugely under-rated position.I think its pretty obvious were light on the ground there at the moment, she said on Wednesday.I dont know if its the most glorious position out on the court, and its not the one that gets all the kudos.But certainly wing defence is a pivotal position - when youve got a quality wing defence, you know.Long-time centre Laura Langman, who made her debut 11 years and 140 games ago for the Silver Ferns at wing defence, has provided that quality since taking over the role in Cullens absence.Langmans speed and ability to read the game have proven invaluable, and her tenacity in marking one-on-one played an important part in New Zealands 53-51 second-Test win in Launceston.Lauras that player that can shut someone down, she does a lot of ground work and wearing down, and she came up with some great tips and intercepts in that second test, Southby said.Circle defender Anna Harrison played a cameo quarter on the wing in the third Test, but her impact is greatest at goal keep or goal defence.The New Zealanders give away significant height to Australian shooters Caitlin Bassett and Gretel Tippett, who both top 1.90m comfortably, and Southby says more work is needed up-court to slow down the feed into the rangy, mobile pair.The circle like to know where the feed is coming from, and when thats controlled, it makes their job a lot easier.For a goal keeper or goal defence, if youve got feeders coming from all over the show and spinning at you, its damn hard work.Tippett shared game time with veteran goal attack Natalie Medhurst in the first two Tests, but played all four quarters in the third and looks to be an exciting long-term prospect for Australia.The 23-year-old basketball convert has only 12 Tests to her credit, but has impressed Southby with her increasing confidence and maturity.There was a lot more determination about the way she played in the third Test, and we didnt get into her head at all.We know weve got a lot of work to do to shut her down. 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On Tuesday, Ottawa placed forward Cory Conacher and defenceman Joe Corvo on waivers as trade rumours swirl around the Senators. Its not lost on Sydney FC that struggling Adelaide have amassed as many A-League points as the runaway leaders have dropped.Yet, the Sky Blues refuse to take Saturdays top-versus-bottom clash lightly, wary it was about this time last season that Guillermo Amors defending champions starting firing.The Reds had three points after seven rounds in 2015-16, one more than the two theyve accrued in the same period of this, so far horrendous campaign.After eight games, they were still tied to the bottom of the table, but Sydney centre-back Alex Wilkinson is mindful of what happened next - a 14-match unbeaten run that ended with the premiership-championship double.And, he said Graham Arnolds undefeated Sky Blues, who dropped their first two points in last weekends draw with Brisbane, were prepared to host a team low in confidence but even hungrier for a win.Obviously, Adelaide have had a few struggles early on this year, just like they did last year - and look where they ended up last year, Wilkinson said.Theyre definitely not a team that deserves to be on the bottom of the league.Well be treating them with the same respect we treat every opponent (with).Were expecting a difficult game and theyll be well up for getting their first win of the season.Obviously, Adelaides confidence might be a little low so, if we can get on top of them early and maybe grab a goal, that would be great for us and put them on the back foot.ddddddddddddArnold will again field a perfectly fit squad - albeit potentially with Wednesdays FFA Cup final in mind.The Reds, plagued by injuries, appear to be emerging from the darkness with striker Henrique back from a knee problem to boost the attack along with Sergi Guardiola, who appears to have promptly recovered from last weekends injury against Perth.But Arnold sees a clear advantage in Amors absence from the Allianz Stadium sidelines as the Spaniard serves a one-match ban for his outburst during Uniteds controversial loss last Friday to the Glory.You saw the same with Kenny Lowe; its not the same for the players without the coach on the sideline, Arnold said.The players always look across to the coach for reassurance and tactical instructions.STATS THAT MATTER:* Adelaide have won four of their six most-recent games against Sydney and are unbeaten in the past three* The Reds have kept a clean sheet in their past four regular-season away matches with the Sky Blues, outscoring them 9-0 across that period* Sydney have conceded the most fouls (128) and won the fewest (83) of any team this season* Sergi Guardiolas 20 shots at goal are the second most of any player this season and four more than any Sydney player ' ' '