In-form opener Phil Jaques cracked his second century in three days to help put New South Wales in a strong position of 325-5 at the end of the first day of its tour match with England at the SCG.
The 27-year-old continues to put pressure on Australian selectors for the upcoming Ashes series after adding to his century for the Prime Minister's XI against England in Canberra on Friday with a classy knock of 107 against the tourists on Sunday.
Katich made a tidy 68 and Michael Clarke a flashy half-century to boost the home team's total before two late wickets saw England claim some joy after Jaques had tormented them with the bat earlier in the day.
After losing opener partner Ed Cowan for 26 in the ninth over, Jaques combined with skipper Simon Katich for a stout second-wicket stand of 155 and took apart England's bowlers with some lovely strokeplay.
Katich moved past his half-century while his partner smashed Monty Panesar for six over long-on to close in on his century.
Jaques glanced Giles down leg side for three runs to bring up his ton off just 141 deliveries in an innings that featured 11 sparkling boundaries and two huge sixes before he popped a simple catch to Steve Harmison at mid-off on 107.
Giles had his second when he managed to get Katich to loft a ball to Pietersen in the deep for 68 just before tea for a score of 218-3 at tea.
Shortly after the interval, Trescothick made amends for dropping Katich when on 14 off the bowling of Flintoff by catching Aaron O'Brien (6) at first slip in a wicket maiden from Anderson.
After conceding 39 runs in his first seven overs, Anderson gave up just six from his next eight, as well as claiming the wicket of O'Brien.
Michael Clarke and Daniel Smith put on 65 for the fifth wicket before Monty Panesar was rewarded for some disciplined bowling with the wicket of Clarke (50), Trescothick taking a second catch at first slip.
Smith and Moises Henriques then saw out the session and will resume on 36 and 25, respectively.
Although Andrew Flintoff (0-52) failed to take a wicket, the England captain continued his recovery from injury with a solid 15 overs, while James Anderson (1-45) and Monty Panesar (1-54) improved as the day wore on.
Matthew Hoggard (0-51) and Steve Harmison (1-76) looked a bit rusty in their first match on tour.
