South African batting star Jacques Kallis continued a rich vein of form when he made a century against Western Australia in the cricket tour match here.

Kallis was out on the stroke tea for 120 as South Africa reached 3-278 - an overall lead of 45.

The South Africans indicated they may declare late in the day to give Test spearhead Allan Donald a handful of overs after he missed a day's bowling on Sunday with a foot injury.

Donald had a hole drilled in the big toenail of his left foot to help ease bruising caused by a new pair of boots which didn't fit properly.

Kallis arrived in Australia after scoring 590 runs at an average 295 in South Africa's four home Tests this summer.

He showed every sign of continuing that form with an effortless ton.

His century took 199 minutes but 60 of the runs came in boundaries - 13 fours and three sixes - as he batted patiently and waited for the bad balls.

He was eventually caught behind off Brad Hogg, the ball hitting his pad and bouncing off his glove as Ryan Campbell took a good reactionary catch.

In favourable conditions, Kallis and Neil McKenzie, who was 81 not out at tea, made sure they had a decent innings ahead of the Test match against Australia starting in Adelaide on Friday.

They smashed 157 runs in the middle session, as they added 161 for the third wicket.

Earlier, opener Gary Kirsten blew a chance to gain some valuable practice on the last day, getting out for 59 six minutes before lunch when he spooned a return catch to the left arm wrist spin of Hogg.

Kirsten's fellow Test opener Herschelle Gibbs, after making only two in the first innings, had been unable to bat so far today because of a groin strain.

Kallis revelled against Hogg, hitting two sixes and a four off one over with brutal strokeplay.

Earlier, Jacques Rudolph was caught behind off Gavin Swan without adding to his overnight score of 12.

The WA attack was missing pace spearhead Matthew Nicholson, who made his maiden first-class century yesterday after taking five wickets in South Africa's first innings.

He was unable to bowl because he was struck a painful blow on the toe while batting.

© 2001 AAP