When, as expected, Arne Slot arrives at Liverpool’s training centre this summer, he will find at least one amenity perfectly to his taste. Slot is among the growing cast of top-level individuals in football hooked on padel, the high-paced racket sport that lands somewhere between tennis and squash.At Feyenoord’s training base in the Dutch city of Rotterdam, chief executive Dennis Te Kloese promised Slot the club would install a padel court — on the condition they won the league title. Slot made them Eredivisie champions last season, and the padel court soon followed.It means there is at least one shared trait between Slot and his Anfield predecessor Jurgen Klopp; the German has his own court at Liverpool’s training centre, competing against members of his backroom staff and calling padel “the best game I’ve ever played” (apart from football).Reasons for optimism or the same old failings exposed?When it comes to perceptions of Ange Postecoglou, Sunday’s north London derby reinforced both of those points of view.The 3-2 home defeat to Arsenal was a strange game. Tottenham weren’t that bad in the first half when falling 3-0 behind, nor were they especially brilliant in almost rescuing the game in the second. But both halves underlined a couple of key characteristicsofPostecoglouSpurs.