GRAND FINAL: Leeds v St Helens
Venue: Old Trafford Date: Saturday, 10 October 2009 Kick-off: 1800 BST
Coverage: Full commentary on BBC 5 live sports extra, live text on BBC Sport website, coverage on BBC Radio 5 Live and local radio. Live on Sky Sports 1.
Highlights Super League Show on BBC Two on Sunday at 1830 BST
Peacock has scored eight tries for Leeds this season
Leeds forward Jamie Peacock believes the team that controls its emotions the best will win the Grand Final when the Rhinos take on St Helens on Saturday.
Tempers flared during Leeds's 18-10 win in last month's Super League meeting.
Keith Senior was banned for flooring Jon Wilkin while James Graham did not shake hands with Leeds players after being angered by Jamie Jones-Buchanan.
Peacock said: "It's about controlling emotions. If you become too emotional it is detrimental to how you perform."
Jones-Buchanan was punished for a 'chicken-wing' tackle on Graham and the Saints front rower was then accused of a lack of sportsmanship after refusing to shake hands with the Leeds players after the game.
England captain Peacock, 31, believes how Graham reacts at Old Trafford could prove decisive.
He said: "Jamma is just passionate and it overflowed a bit for him the last time. He's an important part of how they play and he is a player we need to look out for.
"Passion is part of Jamma's game. It's good for him and good for the game, but it's for him to control. We can't control the mindsets of other players."
The September victory over Saints came in the middle of a run that has seen the Rhinos win 13 of their last 14 games and they are favourites to become the first team to win a third successive Grand Final.
Saints, in contrast, have won just six of their last 12, but they have only conceded two tries in the play-offs and Peacock is wary of the threat they will offer.
"Saints have performed in the last two games when they've needed to, which is a sign of a classy team," he said.
"We could have played better in the last couple of games. We've done what is necessary to win. We're going in with form but I think Saints are going in with better form than people suggest."
The Rhinos beat the Saints 33-6 and 24-16 in the last two Grand Finals, but Peacock, who has been on the winning side in the Old Trafford showpiece a record five times, says those victories will have no bearing on Saturday's game.
"I don't think the last two years comes into it," he insisted.
"You can't afford to spend time thinking about that.
"It would be nice to win three in a row but, if you concentrate on that, you've a chance of slipping up. We've got to concentrate on performing and, if we do that, history will take care of itself."