In a shocking move, the 23-year-old two-match old batsman was named captain for the remaining five ODIs against India owing to Faf du Plessis withdrawal due to a finger injury.
"It's a big honour. The selectors showing confidence in me to take over, it means quite a bit. It's a super humbling experience, but yes, we're going to need to do this for Faf, I believe," said Markram on the even of second ODI.
"I managed to sleep, yeah," he added, laughing.
"It's going to be an additional pressure to deal with but I believe it's a good pressure. You get good and bad sort of pressures, and for me its really a pressure that hopefully I can thrive on."
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The pitch at Superspot Park looks an ODI batting beauty and the spinners will come into play again. Markram said that he might look to make some changes.
"I believe there are quality batsmen in our middle order and it's just about taking responsibility. Obviously weve had to adjust our gameplans just a touch going into this game, but it wasnt addressing any sort of problem, I dont think, he added, about facing the Indian wrist-spinners.
Talking about possible batting changes, the skipper said, "Hashim Amla has been so good at the top of the order for us. He just provides that calmness and hits good cricket shots when the field is up, so hes a massive asset up at the top for us. I dont think there is any need to adjust the batting line-up per say. I just think players need to develop some nice and strong game plans.
"But yeah, it would make sense for me to go up to No.3. From there onwards theres plenty of experience in JP Duminy and David Miller. So well organise and go according to how the game dictates tomorrow, he added.
Du Plessis had ruled out the possibility of South Africa fielding two spinners (Tabraiz Shamsi with Imran Tahir).
The key for the young captain will be handling the pressure of a mighty opponent in India, as well as managing former captains and senior players on the field.
"Faf's sort of taken me under his wings since Ive been involved in the environment. Ill keep sending messages on and off the field, asking for advice, asking for any hints. But at the end of the day, its going to be my decision to make on the field though.
"Fortunately, theres plenty of experience within the squad and it wont be a decision made just by myself. Ill definitely consult the senior players, obviously for the better interest of the side as well, said Markram.