Two weeks after Jannik Sinner’s shock second-round collapse at Roland Garros, eight-time Grand Slam champion Andre Agassi delivered a critical verdict. “There’s no excuse for him to run into a wall at one hour, 45 minutes,” Agassi said of how Sinner battled with the Paris heat. And Andy Roddick, for one, had no reservations about where he stood. “Is it unfair to say that under any circumstances you should be able to get through an hour and 40 mi…