Jasprit Bumrah celebrates the wicket of Tristan Stubbs.
Karn continues as Ashutosh heaves the second ball in the gap at midwicket for a four followed by a single.
Rizvi, on 19, lofts the spinner straight down the ground as Jacks drops an easy catch. He misjudges the catch completely, running in way too much from long-off, before the ball goes off his finger tips and bounces inside the ropes and goes for a four.
Rizvi takes a single before Ashutosh smashes Karn powerfully over long-off for a six, to get 16 from the over.
MI bring back their premier spinner Santner back into the attack. Rizvi clips the first ball off his pads for one before Ashutosh is beaten by some away turn.
Wicketkeeper Rickelton again shows some quick reflexes to whip off the bails in a flash. But Ashutosh has managed to drag his feet back in the nick of time.
Santner is enjoying bowling on this pitch, getting it to turn quite a bit and using the angles to his advantage.
Ashutosh picks a single before Rizvi smashes it straight back at Santner, who makes a good attempt but is unable to take the catch.
Rizvi inside edges the last ball as Santner concedes just two runs from the over.
Bumrah (1/6 in 2 overs) and Santner (1/9 in 3 overs) have combined kept Delhi in a leash, taking 2/15 in five overs combined.