India's Ravindra Jadeja took two wickets but South Africa extended their lead to a formidable 395 as they closed in on a series win in the second Test on Tuesday.
World Test champions South Africa lead the two-match series 1-0 and even a draw in Guwahati would seal a series victory, their first in India since 2000.
India suffered their fourth defeat in six home Tests in the opener in Kolkata and the hosts would need to bat long to avoid another loss.
The Proteas reached 107-3 at the first break after they lost three wickets in the morning session.
Tristan Stubbs, on 14, and Tony de Zorzi, on 21, were at the crease.
Play starts 30 minutes early in the northeastern city because of early sunsets with the order of intervals reversed, meaning the shorter tea comes before lunch.
South Africa resumed on 26-0 after bundling out India for 201 on day three to lead by 288 in the first innings.
They did not enforce the follow-on.
Left-handed opener Ryan Rickelton hit three fours in the first session before he fell to Jadeja's left-arm spin while attempting another hit over cover but got caught out. He made 35.
Jadeja (2-20) bowled the other overnight batter, Aiden Markram, for 29 before fellow spinner Washington Sundar dismissed skipper Temba Bavuma for three.
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