The exit of Jenson Brooksby, the last American remaining in the singles at the 2021 U.S. Open, left the host nation without a player in the quarter-finals for the first time since the inaugural tournament 140 years ago. It was the first time for the 20-year-old California native, who is ranked 99th, to reach this stage of competition in a match against world number one Novak Djokovic of Serbia. Brooksby, playing in just his eighth Grand Slam singles match at Flushing Meadows on Monday, threatened Djokovic to become the lowest-ranked male player to ever take down a world ranking player at the U.S. Open after winning the opening set. In the end, though, it was Djokovic who dug deep under the lights at Arthur Ashe Stadium, overcoming the loss of the first set to see off Brooksby 1–6 6–3 6–2 6–2. Djokovic next meets Italian sixth seed Matteo Berrettini in a …