World number two Carlos Alcaraz admitted he "was not up to the level" of 18th-ranked Ugo Humbert of France who swept to a shock Paris Masters third round victory over the Spanish superstar on Thursday.He was knocked out in the second round of the US Open by 74th-ranked Botic van de Zandschulp, defeated top-ranked Jannik Sinner in the Beijing final before a quarter-final exit at the hands of Tomas Machac, the world number 33, at the Shanghai Masters.