* Cavani scores in first minute before wasting chances * Sanchez levels for Arsenal after the break * Cavani put PSG ahead in first minute * All square in Group A after Basel and Ludogorets also draw 1-1 (Adds quote) By Julien Pretot PARIS, Sept 13 (Reuters) - Paris St Germain wasted the chance to ignite their stuttering start to the season when they were held to a 1-1 home draw by Arsenal in their Champions League Group A opener on Tuesday. The hosts enjoyed a dream start when Edinson Cavani put them ahead in the first minute but PSG squandered numerous opportunities and paid dearly when Alexis Sanchez swept in an equaliser late in the second half. More...