South Africa reached 3-155 in its second innings, an overall lead of 147, at stumps on day two of its three-day tour match against Western Australia A at Perth's James Oval on Monday.

Jacques Rudolph was 72 not out and Ashwell Prince unbeaten on 46 for the tourists in their final warm-up match before the first Test against Australia at the WACA which starts on Friday.

Arron Crawford removed AB de Villiers (5) and Justin Kemp (10) to end day two with 2-36 from his seven overs.

Earlier, furniture removalist Luke Pomersbach smashed a sensational 145 from 128 deliveries in the home side's first innings of 5(dec)-300.

WA A led by eight runs after South Africa declared its first dig on Sunday at 8-292.

The 21-year-old Pomersbach, who isn't a contracted WA player, hit 21 boundaries and three sixes in a commanding knock.

Pomersbach and Liam Davis (60) shared in a 135-run third wicket stand.

Shaun Pollock was the pick of the South African bowlers, finishing with 3-51, while Andre Nel and Charl Langeveldt picked up one wicket each.

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