Somerset seamer Thomas then struck immediately when he had Pettini caught at mid off off his first ball.
Left-arm spinner Ant Botha and seamer Tom Lungley shared the bowling honours, taking four wickets each.
The Nottinghamshire seamer suffered a hamstring strain in the final one-day international on Saturday.
The 30-year-old left-arm seamer missed Friday's humiliating 158-run loss in Rajkot with Achilles problems.
Surprisingly, the 32-year-old Gloucestershire seamer was given the new ball ahead of Stuart Broad.
He will be joined by all-rounders Andrew McDonald and Shane Watson, and probably seamer Stuart Clark.
Lancashire have loaned out seamer Oliver Newby to Gloucestershire for a month-long period from 28 July.
Former England seamer Geoff Arnold is, meanwhile, returning to the club as a bowling coach.
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West Indies batsman Shivnarine Chanderpaul and India seamer Zaheer Khan are the other names on the list.
When right-arm seamer Dammika Prasad then trapped captain Rahul Dravid for 15, India looked in serious danger.
The former England seamer ripped through Leicestershire's middle order to claim 5-60 in a tightly fought encounter.
Veteran spinner Ashley Giles (groin) and seamer James Anderson (back) have missed the entire summer with injury.
Fit-again Warwickshire batsman Ian Bell and Yorkshire seamer Tim Bresnan make up the party to defend the Ashes.
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The seamer recorded match figures of 9-125 with an exemplary display of swing bowling on a flat wicket.
Seamer Katherine Brunt won the Women's Cricketer of the Year prize and Chris Edwards claimed the disability award.
Spinner Dean Cosker and young seamer James Harris also caught the eye as they each took over 50 apiece.
Meanwhile, Munaf Patel replaces left-arm seamer RP Singh, who was deemed surplus to requirements along with all-rounder Yusuf Pathan.
Former Middlesex seamer Chris Whelan, making his debut, removed du Toit when the South African top-edged an attempted pull.
He lasted just 16 minutes and faced only 13 balls before promising left-arm seamer Charl Willoughby uprooted his off-stump.
New Zealand seamer Erin Bermingham took a career-best 4-35 from her 10 overs.
But the tall Hampshire seamer bowled Dravid off an inside edge and saw a diving Prior brilliantly snaffle Ganguly.
Ireland seamer Alex Cusack returned figures of 4-18 as Sri Lanka were restricted to 144-9 off their 20 overs.
There were a few uncertain moments early on, particularly against Zaheer Khan, India's left-arm seamer who has been inspired in this series.
After striking six boundaries, Read drove at a wide delivery from seamer Gayan Wijekoon to provide a catch behind.
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Seamer Richard Jones took three wickets, including openers Will Jefferson and Matt Boyce.
Durham seamer Plunkett, 24, has played nine Tests and 27 ODIs, but last featured for his country in July 2007.
Seamer Tawanda Mupariwa and spinner Ray Price then took three wickets each as as Bangladesh were bowled out for 254.
Chennai Super Kings, one of the top franchises, has two Sri Lankans - seamer Nuwan Kulasekara and off-spinner Akila Dananjaya.
Seamer Ryan Sidebottom will miss the tour having failed to recover from a side strain sustained during the one-day series.
Left-arm seamer Charl Willoughby later took two wickets in five balls before rain sent the teams off for the day.
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