Kevin Pietersen: I made mistakes over England Pietersen enjoyed a gentle reintroduction to action on Friday as he spent a full day in the field after Surrey's acting captain, Vikram Solanki, won the toss and watched Yorkshire's fourth-wicket pair of Andrew Gale and Gary Ballance pile up 204 in 55 overs. Pietersen fielded throughout the day at mid-off, where he was out of the firing line until Gale, on 95, miscued a drive off Gary Keedy and he was unable to hold a difficult catch running back. "It's not just playing here and getting runs, it's doing all the hard yards," said Surrey's executive director, Alec Stewart. You can do all your rehab, all your gym work and all your shuttles but standing in the field for 6½ hours is part of cricket. He's in an ice bath now, he's bound to be sore but first game of the season when you have been 100 per cent you are sore. The good thing is that he has got 6½ hours in his legs and that will only help him for the second innings and beyond when the Ashes start. Pietersen's other contribution to proceedings, which were watched by England selector James Whitaker, was to bowl four overs of gentle off spin before tea which went for 13 runs but failed to break the fourth wicket partnership. His first innings since the second Test against New Zealand in Wellington will have to wait, probably until later on Saturday, after Gale continued a rich vein of form with his third century in as many championship innings. Two weeks ago Gale had gone two years without a century in the competition but a maiden double hundred against Nottinghamshire at Scarborough helped to restore form and confidence. The chance to Pietersen was Gale's only blemish in a superbly compiled 137-ball century which he reached by sweeping Keedy for his 12th four. Ballance, who will join England's Twenty20 squad after Friday's play, played a sensible supporting innings of 90 before he was pinned lbw by Jon Lewis who striuck again with the second new ball when Adil Rashid was snaffled by Solanki at second slip. It was a tough first day in charge for Stewart following the sacking of Surrey's previous coaching team of Chris Adams and Ian Salisbury earlier in the week. The withdrawal of Ricky Ponting, who complained of a sore hand sustained during fielding practice on Wednesday, was another setback for Surrey and meant Gary Wilson had to be summoned from a second team Twenty20 match in Canterbury. By the time Wilson, who had to go home to collect his whites, arrived in Leeds Surrey had broken a solid opening stand of 62 between Adam Lyth and Alex Lees and continued a miserable run of form for Joe Sayers who fell for his fifth single figure score in six championship innings.