[Scorecard: MI Vs DC]
In pursuit of just 101 from 120 balls, Steyn led Deccan"s fightback by getting Richard Levi bowled off the first ball. But Rohit Sharma and Ambati Rayudu ensured that Mumbai reached the target, 101/5 in 18.1 overs.
The win took Mumbai to third spot in the points table with 10 points from nine games while Deccan are fixed at the last place with three points from eight matches.
The South African fast bowler, Styen, bowled with pace and was exceptional on the night. However, his figures of 2/10 in four overs could not stop the home team from winning. Maybe a few more runs would have been better for the visitors on a difficult surface for batting.
Steyn bowled 17 dot balls in his 24. It was a brilliant effort from him. He could have had one more wicket but James Franklin was dropped by Amit Mishra. Steyn won the Man-of-the-match award.
There was a memorable moment for 19-year-old Deccan fast bowler Veer Pratap Singh as he dismissed Sachin Tendulkar. When Tendulkar made his debut for India in 1989, Veer was not even born. The right-arm bowler from Bengal was born in 1992. He will remember this wicket for a long long time.
Rohit topscored in a cautious chase with 42 while Rayudu was the finisher with an unbeaten 19.
Deccan Chargers Innings
Mumbai Indians were exceptional in the field as they bowled out a dismal Deccan Chargers to 100 in 18.4 overs.
Lasith Malinga was the top bowler for the home team with figures of 4/16 in 3.4 overs.
Captain Harbhajan Singh"s decision to ask the opposition to bat was justified as regular strikes from his bowlers, including himself, exposed Deccan"s batting on a pitch which has some grass.
Harbhajan till this match was disappointing with the ball. He had said that he needed to lift his game and what performance from the skipper. Opening the bowling, he took two wickets for just 13 runs in four overs.
Deccan, after a decent start from their openers Parthiv Patel and Shikhar Dhawan, just fell apart. Mumbai"s bowlers and fielders never allowed Deccan batsmen to come back into the game. Dhawan was the topscorer with 29.
From 37/1 in 5.3 overs, became worst. It was 66/6 in 13 overs and 90/8 in 17 overs.
Deccan might be regretting the move to drop their regular skipper Kumar Sangakkara.
Mumbai Indians captain Harbhajan Singh won the toss and elected to field first against Deccan Chargers in Game 40 of IPL 5.
Deccan have rested their regular captain Kumar Sangakkara and Cameron White will lead the side. For Mumbai, opener Richard Levi and fast bowler Munaf Patel return to the playing XI. Mumbai's big-hitter Kieron Pollard, who injured his shoulder, misses out and also Rahul Shukla who played in last game. Bharat Chipli returns for Deccan.
White said coach Darren Lehmann and Sangakkara thought this was the best playing XI for today.
This is the return leg match between the two sides. In Visakhapatnam, Mumbai had sealed a last-ball thriller when Rohit Sharma hit a six off Daniel Christian.
Mumbai have eight points from as many games while Deccan are with three points from seven matches.
Mumbai Indians: Harbhajan Singh (captain), Sachin Tendulkar, James Franklin, Richard Levi, Dinesh Karthik (wicketkeeper), Lasith Malinga, Munaf Patel, Robin Peterson, Rohit Sharma, Rudra Pratap Singh, Ambati Rayudu.
Deccan Chargers: Cameron White (captain), Parthiv Patel (wicketkeeper), Shikhar Dhawan, Bharat Chipli, Jean Paul Duminy, Dan Christian, Ashish Reddy, Amit Mishra, Ishank Jaggi, Dale Steyn, Veer Pratap Singh.
Umpires: Anil Chowdhury (India) and Bruce Oxenford (Australia)
Third Umpire: Aleem Dar (Pakistan)
Match Referee: Javagal Srinath (India)