By Matt Hardy No matter the result at Flushing Meadows on Sunday night the world of tennis was going to be exposed to a new Grand Slam winner, but in Carlos Alcaraz’s victory at the US Open the sport might have uncovered its next superstar. While the world basks in the ability to say they lived through the era of Rafael Nadal, Roger Federer and Serena Williams, the foundations are being set by a number of youngsters to become the next great – and Alcaraz is one of those. Beating Norwegian Casper Ruud 6-4 2-6 7-6 6-3 with the world No1 spot on the line, 19-year-old Alcaraz continued his fine se…