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ICC World Test Championship: Former opener and head coach Justin Langer has advised Australia to retain Marnus Labuschagne in their top-order, saying that omitting him from the side would hinder the development of future Test team batters.

Labuschagne's spot has become doubtful after Australia suffered a five-wicket defeat to South Africa in the ICC World Test Championship final. Labuschagne was moved up to open against South Africa, but scores of 17 and 22 meant he ended the two-year cycle with an average of 27.82.

"Marnus is a 50-Test player. He's been the best player in the world. He still averages (46.19). All players go through it. If you're not scoring runs, you're going to be under the spotlight. But all of a sudden David Warner leaves. And then Usman Khawaja leaves. And then Steve Smith.