Carlos Alcaraz moved into the third round of the U.S. Open with a 6-3 6-1 7-6(4) win over Lloyd Harris on Thursday in a match that also revealed a lack of sharpness which the Spaniard will need to rectify if he is to successfully defend his crown.
Some dazzling shot making from the world number one had the crowd on its feet but behind the fun-filled evening were some worrying flaws as Alcaraz piled up 29 unforced errors and showed a lack of concentration at key moments.
Even while not at his best Alcaraz could rely on raw talent and a vast repertoire of shots to see off the 177th ranked South African.
But the 20-year-old will need to improve with rival Novak Djokovic on the prowl for a 24th Grand Slam and seeking revenge for his Wimbledon loss to the Spaniard.