Geelong coach Mark Thompson celebrated his contract extension at Skilled Stadium by watching his all-conquering Cats chalk up win number 55 in their past 58 matches on Sunday to ensure they head into next week's top-of-the-table showdown against St Kilda still unbeaten.

The Cats wracked up win number 13 in a row to start season 2009, against an outclassed Port Adelaide, but it wasn't all smiles for Thompson.

While the Cats were never in any danger of defeat on a day when Thompson signed a two year contract extension tying him to Skilled Stadium until the end of 2011 - the Cats' coach would not have been happy with the performance of his key forwards or his team's dismal final quarter.

Despite the Cats dominating possession during their 18.14 (122) to 13.10 (88) victory, their two key forwards in Cameron Mooney and Tom Hawkins and this year's leading goalkicker Steve Johnson had little impact on the game.

In fact the trio kicked just three goals between them despite having plenty of chances thanks to the dominance of the Cats' fantastic midfield as the home side wracked up 87 more possessions for the game.

Instead it was the underrated Shannon Byrnes, who the hero after kicking four goals to go with the five he kicked in last week's win against Fremantle.

As for Port, their fifth loss in their past seven matches is not likely to have an effect on their coaching situation with Mark Williams still expected to be rewarded with a new two year deal this week.

But watching this game on Sunday, it was hard to believe these two teams played off in the 2007 grand final and indeed you could easily argue the Power has never recovered from the record 119 point mauling they received from the Cats that day.

While the Cats have gone from strength to strength - despite last year's shock grand final loss to Hawthorn - Port continues to perform like a mid-table side and only had defenders Troy Chaplin, Alipate Carlile and Toby Thurstans to thank for coming away from Skilled Stadium with at least their pride intact on Sunday.

But besides those three it was really on ex-Tiger David Rodan who tried to generate any attacking momentum for the Power although Kane Cornes at least restricted the influence of Cats' playmaker Joel Selwood but at the expense of his own game.

After two trips to Perth for their last two matches,