McSweeney back in runs for South Australia

Nathan McSweeney has hit a century for South Australia in the Sheffield Shield match against WA. (Matt Turner/AAP PHOTOS)

Nathan McSweeney has hit his first century since last summer's brief stint in the Test side, with his ton giving South Australia hope of a win against Western Australia.

South Australia went to stumps on day three at 4-297, leading WA by 205 and eying off the chance of setting a fourth-innings target at the WACA on Friday.