Osborne will be out to steal top spot from Rand on Saturday.
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The club holds a five-two win-loss record heading into its away game against Lockhart.
However, the visitors not only have to win the game, but hope Brock-Burrum can cause an upset at home against ladder leaders and premiers Rand.
But the newly combined team will have to lift after Osborne destroyed it for just 59 last week.
Elsewhere, The Rock Yerong Creek will host Holbrook.
The Rock's Jack Driscoll was outstanding against Walbundrie last week.
He opened the batting and struck 67 before snaring 3-16 in the home team's 22-run win.
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Walbundrie will look to bounce back when it travels to Henty.
The home outfit sits just outside the top six with a three-four record.
Henty displayed its batting firepower in coasting to an eight-wicket win over Culcairn.
And Culcairn travels to Walla.