Martin Odegaard's penalty proved enough to give 10-man Arsenal a gritty 1-0 victory at Crystal Palace to maintain their winning start to the Premier League season.Only Manchester City and Brighton had won their opening two games but the Gunners joined them on six points after a narrow success at Selhurst Park.In a close-fought encounter, captain Odegaard stepped up to steer home a second-half spot-kick, with the visitors then hanging on for the final quarter of the game after Takehiro Tomiyasu was sent off.The defender was the only change to Mikel Arteta’s starting XI from their opening-day win against Nottingham Forest as he replaced the injured Jurrien Timber at left-back – but he will now be banned for Saturday’s visit of Fulham after a controversial dismissal here.Palace – unchanged from their own victory at Sheffield United a week ago – were fast out of the blocks, Aaron Ramsdale making a low stop to keep out an Eberechi Eze drive as the hosts built up a head of steam.Cheick Doucoure then flashed a speculative effort wide as Arsenal struggled to get a foothold on proceedings.The visitors gradually started to see more of the ball and Eddie Nketiah was unfortunate to see his shot come back off a post after beating Sam Johnstone in the Palace goal.With the game opening up, both sides had good chances, with Jordan Ayew almost capitalising on a poor William Saliba touch, only for the France defender to makes amends with a fine, last-ditch tackle.Arsenal went down the other end and Nketiah wasted a gilt-edged opportunity as he tried – and failed – to execute a deft lob over Johnstone from close range.Odegaard was next to come close to breaking the deadlock for Arteta’s side, his curled strike from outside the box tipped