It was a blistering start for MI as Suryakumar (53 in 32 balls) and Lewis (48 in 28 balls) raced to a 100-run partnership.
Delhi wicket-keeper Rishabh Pant was the other major contributor with the bat scoring 47 runs off 25 balls.
Lewis was unbeaten on 37 off 16 balls while Suryakumar Yadav was batting on 41 as the Delhi bowlers erred in their lengths and were duly punished.
Both the batsman cleared the boundary ropes easily as runs began to flow thick and fast. Trent Boult and Mohammad Shami both are being punished without discrimination.
The Delhi bowlers have also been below par and need to get their act together to register a win.
SRH seemed to be in control as they needed four off the final five balls, but they could manage just four off the next four deliveries. The duo wrecked havoc and helped MI go past 50-run mark in just 3.4 overs.
The Delhi Daredevils have been much better in the bowling department compared to their batting performance which has let them down in their previous games. Even despite some quick wickets from Krunal Pandya, Jason Roy and Shreyas Iyer ensured that their side secured the first victory of the tournament to open their account on the points table. Players make plenty of runs to get these titles, perform well on the field or pick up wickets. It is now time for other bowlers, like Jasprit Bumrah and Mustafizur Rehman, to give their best to the team's bowling attack. Young Jharkhand keeper Ishan Kishan further stepped on the gas with a 21 ball 43 (SR: 191.30) in a fifty run stand with skipper Rohit Sharma (18). Kieron Pollard also failed miserably and went for a golden duck.
Young Mumbai spinner Mayank Markande, who is now the highest wicket-taker of the ongoing IPL 2018 tournament, has retained the Purple Cap. Whereas, Delhi never had a chance of holding the trophy and is gunning to win the coveted title under veteran opener Gautam Gambhir's guidance.
First on Saturday, MI's West Indian left-hander Evin Lewis and the in-form local talent Surayakumar Yadav showed their mettle against seamers Roy, Pant and Hardik Pandya and spinners Akila Dananjaya and Mayank Markande.
The 19-year-old left-hander hit two sixes and a four off Rahul Tewatia as Mumbai garnered 19 runs from the over.
Mumbai: Owing to an extremely explosive start by openers Suryakumar Yadav and Evin Lewis, Mumbai Indians (MI) piled up a enormous score of 194/7 against Delhi Daredevils (DD) after being put in to bat first at the Wankhede Stadium here on Saturday.