Mumbai, Sept. 7 -- They have hopped from one tournament to another sharing a chartered flight in China last year. They've run into each other dining at the same restaurant in New York this fortnight. They've walked on court together seven times in the past 18 months. The tennis world can't get enough of Jannik Sinner versus Carlos Alcaraz. Have they had enough of each other lately? "Off court, we bump into each other occasionally, I don't know if we're happy or not," Sinner said with a chuckle. "On court, we like to see each other, because it means that we are doing well in tournaments." "Doing well" is the ultimate understatement. So good have Alcaraz, 22, and Sinner, 24, been in Grand Slams this year that they've confined the 38-year-old ...