Just some months ago, after lying on the floor for a few seconds to let the whole reality of his victory sink in, Paul Jubb became the first Briton and first man wearing the colors of the University of South Carolina’s Gamecocks to lift the singles trophy of the NCAA Division I Men’s Tennis Championships, the biggest achievement for tennis players evolving at college level in the United States. Even if this was not his first significant result—Jubb, under-16 Boys singles champion at the LTA British Nationals in 2015, had already made it all the way to winning a Futures title in Lithuania in 2018—things seem to have gotten better and better for the Briton since May. In June, Jubb defeated Denis Istomin and Andrey Rublev to bypass the qualifying phase of the Eastbourne ATP 250, only letting Taylor Fritz dismiss him from the tournament. So …