ROME—Novak Djokovic was tested by 61st-ranked Tomas Martin Etcheverry in a 7–6 (5), 6–2 opening win at the Italian Open on Friday. Aiming for a seventh title on the red clay of the Foro Italico as he prepares for the French Open, Djokovic twice had to recover from deficits during a tight first set. Djokovic…