The Black Caps are in firm control of the first test against South Africa in Mount Maunganui.

After posting 511 in their first innings, New Zealand have the Proteas reeling at 80/4 at stumps on day two.

Kyle Jameison struck twice inside the first ten overs with Tim Southee and Mitch Santner each claiming late wickets to leave South Africa in serious strife.

Daryl Mitchell eyes a sharp piece of fielding from South African bowler Neil Brand during the Black Caps' first innings of 511 at Bay Oval. Photo: Jamie Troughton/Dscribe Media.

Still trailing by 431 runs, the tourists need a miracle to avoid a follow on on Wednesday.

After a solid start, Kyle removed skipper Neil Band for four and then had Raynard van Tonder trapped in front for a duck.

South African skipper and spin bowler Neil Brand takes a sharp caught-and-bowled to dismiss Black Caps batter Daryl Mitchell during the first test at Bay Oval.  Photo: Jamie Troughton/Dscribe Media.

Having produced just one with the bat, Devon Conway pulled off a superb catch to dismiss Edward Moore off the bowling of Matt Henry.

Mitch capped the day by castling Zubayr Hamza for 22.

Earlier in the day, Rachin Ravindra scored a maiden double century in just his fourth test match.

Rachin Ravindra celebrates his double century during his innings of 240 as the Black Caps took control on day two of the first cricket test at Bay Oval. Photo: Jamie Troughton/Dscribe Media.

Starting the day on 118, Rachin notched 200 runs off 341 balls early on in the second session of play.

Stuck in the 190's for more than 10 overs and seeing two of his teammates dismissed, Rachin kept his cool, cutting a wide delivery through square to bring up the miletone.

A Rachin boundary brought up the 400 for the Black Caps shortly before tea.

Matt Henry hits a six during the Black Caps' first innings of 511 at Bay Oval. Photo: Jamie Troughton/Dscribe Media.

After scoring his 30th test century yesterday, skipper Kane Williamson added just six runs to his tally before he skied one to mid on to depart for 118.

Rachin was eventually dismissed for 240 - becoming the 19th New Zealand men's batter to make a double century, posting the 12th highest score by a Black Cap.

He faced 366 deliveries in his nine hour stay at the crease.

In his three previous tests Rachin's highest score was 18 not out.

Sitting at the top of the list is former New Zealand captain Brendon McCullum - the only player to make a triple century, at 302.

Mitchell Santner is cleaned up by South African bowler Neil Brand during the Black Caps' first innings of 511 at Bay Oval. Photo: Jamie Troughton/Dscribe Media.

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