Chasing a target of 153, KKR produced a 72-run opening stand in 8.5 overs and needed another 72 from the last 10 overs but 21-year-old Chahar pulled off quite a coup, taking four wickets en route to his game-changing 4 for 27.
IPL 2021: Andre Russell blames nature of pitch for KKR's batting collapse, says his team will bounce back strongly
Needing just 30 runs from 27 deliveries, KKR's experienced finishers— Russell and Dinesh Karthik— faltered big time as the five-time champions Mumbai pulled off an epic comeback to secure their first win of the season.
Check out photos from the fifth match of IPL 2021 between Mumbai Indians and Kolkata Knight Riders.
The best sportsmen and teams are judged on how well they perform under pressure. Mumbai played like a team that just knows how to win. It is a trait that takes a while to build and with five IPL trophies under their belt, that winning culture is now part of each and every player's DNA.
Mumbai Indians came back strongly in the last 10 overs of the match to defend a meagre total of 152 against KKR which managed only 20 runs in the last five overs.
IPL 2021: Royal Challengers Bangalore aim to consolidate position as Sunrisers Hyderabad seek first win of season
While RCB began their campaign with a morale-boosting win over five-time defending champions Mumbai Indians at the same venue, the David Warner-led SRH lost to Kolkata Knight Riders in their tournament opener.
Required to show some sensible approach, it was harakiri of sorts by KKR batting unit as they were restricted to 142/7 to continue their miserable record with MI.
IPL 2021: Rajasthan Royals’ Ben Stokes to miss rest of season after injuring finger in Punjab Kings game
Ben Stokes will stay back with the franchise to provide inputs off the field. Meanwhile, Rajasthan said they will be looking at a potential replacement for the star.
Catch the LIVE score and updates from the IPL 2021 match between Kolkata Knight Riders and Mumbai Indians
IPL 2021: Had 'massive performance anxieties' in preceding years of tournament, says RCB's Harshal Patel
Harshal Patel said he had to deal with a lot of performance-related anxiety due to the ruthless nature of the IPL,
IPL 2021: Jofra Archer returns to light training but participation in Rajasthan Royals' campaign still doubtful
Injuries led to Archer's absence from the early stages of the IPL, where he is the reigning most valuable player, and on an £800,000 ($1.1 million) contract with Rajasthan Royals.
IPL 2021: Skipper Sanju Samson stars with valiant ton but RR suffer four-run loss against PBKS in thrilling clash
Here are the best moments from Punjab Kings' thrilling four-run win over Rajasthan Royals in Match 4 of IPL 2021.
Here's all you need to know about the sixth match of IPL 2021 between SRH and RCB in Chennai.
IPL 2021: Have to do a lot of maintenance work for my lower body, hamstring, says MI captain Rohit Sharma
Rohit Sharma missed some part of the IPL last year and the initial portion of the Australia tour, including the white-ball leg, due to the hamstring injury.
Needing five off the last two balls, Sanju Samson refused to take a single on the penultimate ball of the match but then got out on the last delivery.
Once a vital cog in India and KKR's attack, Kuldeep Yadav has struggled recently and he is not a regular in the playing XI.
IPL 2021: 'Could not have done anything more' — Sanju Samson after RR's narrow defeat to Punjab Kings
Sanju Samson scored a magnificent 119 against Punjab Kings but got out on the last delivery as Rajasthan Royals lost by four runs.
IPL 2021: 'Plan was to feed them wide balls' — Arshdeep Singh on PBKS' death-bowling plan against RR
Arshdeep Singh defended 13 runs in the last over as Punjab Kings defeated Rajasthan Royals by four runs.
Samson is also infamous, till date, for following up his big scores with periods of absence; the Sharjah start last year was the first instance of Samson posting back-to-back 50+ scores in the same IPL season.
IPL 2021: After impressive beginning, KKR aim to continue winning momentum against nemesis Mumbai Indians
KKR have won just once in their last 12 games against Mumbai Indians.