Stefanos Tsitsipas already had a lot going on as he arrived at the French Open.
He was trying to reach the level of the Grand Slam champions who came before him, like Novak Djokovic, who has beaten Tsitsipas in two major tournament finals, when he suddenly had to defend an attack from the sport’s young stars, led by Carlos Alcaraz, a 20-year-old Spaniard ranked No. 1 in the world. Tsitsipas, 24, has another priority, too — helping his younger brother Petros, 22, establish his own identity and become a top doubles player. They plan to play as many as nine events together this season, regardless of whether that helps Stefanos’s singles play, which Petros isn’t sure that it always does.