Two quick wickets from Suraj Yadav in the middle session had left Kerala in a bit of a bother at 158 for 4, but Samson (143 batting) and Rohan Prem (42 batting) saw the day through with an unbroken stand of 115 for the fifth wicket after Services put the home side in after winning the toss.
At stumps at the Conor Vayal Stadium at Tellicherry, Samson was batting on 143 off 191, having scored exactly 100 of his runs in boundaries. He has hit hit 19 fours and four sixes in his rollicking innings so far.
For Services, Suraj Yadav took two wickets for 55 runs while Deepak Punia and Saurabh Kumar bagged a wicket each.
Brief Scores:
Kerala: 273 for 4 in 90 overs (Sanju Samson 143 batting, Rohan Prem 42 batting' Suraj Yadav 2/55).