Ishant Sharma and his pace colleagues wreaked havoc with the pink ball to put India in charge of their maiden day-night Test against Bangladesh at the Eden Gardens in Kolkata.
Iyer's teammate pacer Bhuvneshwar Kumar jumped three spots to 17th on the bowler rankings, while former captain Virat Kohli, who was rested for the Sri Lanka T20Is, fell out of the top 10 - he dropped five places to 15th.
Skipper Mehidy Hasan's all-round effort helped host Bangladesh eke out a close three-wicket win over Sri Lanka with three deliveries to spare, to finish third in the International Cricket Council Under-19 Cricket World Cup 2016, in Fatullah, on Saturday.
Bangladesh captain Mominul Haque rued the absence of injured all-rounder Shakib Al Hasan.
Shakib Al Hasan lit up his 50th test with all-round brilliance to help Bangladesh claim a handy first-innings lead over a listless Australia in the second Test on Monday.
India captain Virat Kohli and senior batsman Rohit Sharma retained their number one and two position respectively in the ICC rankings for ODI batsmen, while pacer Jasprit Bumrah remained at the third spot in the bowler's list.
Bangladesh trail by 224 runs and still needed 25 runs to avoid the follow-on at the end of Day 4.
Former skipper and pacer Mashrafe Mortaza, who was left out of the 24-man ODI preliminary squad announced on January 4, has not been named in the final squad.
Kohli and Sharma were sitting pretty with 857 and 825 points respectively in the batting list
After heavy rain washed out more than a session of the day's play, Australia eclipsed Bangladesh's first innings total of 305 by tea before the hosts retaliated in the final session to reduce the tourists to 377-9.
West Indies spinner Fabian Allen on Wednesday moved into the top 10 of the ICC Men's T20I Player Rankings after featuring in his team's fine showing in the ongoing five-match series against Australia.
With 762 points, Kohli is behind England's David Malan
Images from Day 2 of the first Test between India and Bangladesh in Indore.
Debutant Aiden Markram suffered a horror run out just three runs shy of a century as South Africa amassed 298 for one on the first day of the first Test against Bangladesh on Thursday.
Images from Sunday's ICC World Cup match between Bangaldesh and South Africa.
Shamar Springer's unbeaten half-century steered West Indies to a thrilling three-wicket victory against Bangladesh in the semi-finals and set up a title clash against India, in Dhaka, on Thursday.
Former spinner Daniel Vettori will prepare Bangladesh for the tour of India later this year and a trip to New Zealand in 2020.
Opener Jason Roy smashed his way to a sensational 153 as England scripted a dominating performance to hammer Bangladesh by 106 runs in a high-scoring World Cup match, in Cardiff, on Saturday.
England go into the 10-team tournament as the top side in the team rankings with 125 points and India in second position four points behind.
Uncapped Jayed gets call-up
On paper, it is difficult to imagine how Bangladesh will even be able to compete in a format which has been their weakest till date.
India skipper Virat Kohli was pushed to the fifth spot by his English counterpart Joe Root, who rose two rungs to third in the latest ICC Test rankings for batsmen, even as Jasprit Bumrah and Ravichandran Ashwin moved up in the bowlers' chart.
Bangladesh, who were shot out for 106 in their first essay, were reduced to 13 for four at one stage but the visitors ended the second day at 152 for six, courtesy a combative half-century from Mushfique Rahim (59 batting) and Mahmudullah, who retired hurt after scoring 39.
David Warner made 88 not out and featured in two significant partnerships to lead Australia's robust reply to Bangladesh's first-innings total of 305 in the second and final Test on Tuesday.
Earlier, Nathan Lyon kept Australia in the contest, claiming six for 82 to help bowl out Bangladesh for 221 after the hosts had resumed on 45 for one.
In the other match of the day, Dan Lawrence and Jack Burnham hit centuries as title contender England crushed Fiji by a massive margin of 299 runs.
Mushfiqur Rahim's superb hundred complemented by a collective effort from the bowlers saw Bangladesh thrash Sri Lanka by 137 runs despite Lasith Malinga's brilliant international comeback in the Asia Cup opener, in Dubai, on Saturday.
South Africa lost both openers but were still 230 runs ahead of Bangladesh at the close on the third day of the first Test when bad light stopped play on Saturday.
Even though West Indies stars such as Chris Gayle and Andre Russell were not part of that series, Jason Holder's team still must be smarting from those three consecutive losses last month.
BCB named Mahmudullah as the T20 captain, while Mominul will lead the Test side during their much-anticipated tour of India
It was Shami and his pace colleagues who inflicted telling blows that Bangladesh could never recover from.
Sunil Joshi has applied for the national team bowling coach's job
Bangladesh made a perfect start to their World Cup campaign, posting their highest one-day international score of 330-6 during the 21-run win over South Africa.
Rohit Sharma carried his bat, scoring 83 not out, while putting on two good partnerships. He first stitched a 61-run partnership with Dhawan at the top of the order and then joined hands with Dhoni to see India through.
Kagiso Rabada and Keshav Maharaj ran through the Bangladesh batting order to lead South Africa to an emphatic 333-run victory in the first test as the visitors capitulated meekly on the final morning on Monday.
Shakib has already submitted a letter to the BCB asking for a sabbatical and the board has complied with his demand.
Eager to keep their semi-final hopes alive, a desperate Bangladesh will have their work cut out when they take on a spirited Afghanistan in a do-or-die World Cup encounter in Southampton on Monday. England's defeat at the hands of Sri Lanka on Friday breathed air into Bangladesh's hopes of securing a semi-final berth and the 'Tigers' will be keen on making the most of the situation starting with a win over the bottom-placed Afghanistan.
'Under lights, with the late swing, it is challenging for batsmen'
Since the start of the year he has scored 593 runs and only been dismissed in single figures once in his 11 ODI innings -- a run of form he credits to the work he has put in off the field.
Mominul Haque (28) and Tamim Iqbal, who hit a six off the final ball of the day to reach 22, were not out at stumps on Friday as Bangladesh began their reply after South Africa's tea-time declaration on 496 for three.