I saw Shapovalov fill bleachers to full capacity at an early-round qualifying match Thursday, rare pull for someone who still has to fight his way into the main draw. I saw a tennis coach meticulously videotaping his forehand, convinced it was the stroke of the future. There’s buzz around him, and thus far it appears to be justified. He has a nickname; he has acknowledged its existence ; he now has a clinical first-round win at major, the kind of thing you see from tested veterans who are ready for the main course. For Shapovalov, who next faces No. 8 seed Jo-Wilfried Tsonga, anything beyond this point is gravy. As the sport’s current giants age out and create openings for the youth, El Shapo looks like a sudden, but altogether welcome addition to the party.