(Reuters) - World number three Carlos Alcaraz is unlikely to be at his best for Wednesday's ATP Finals match against Andrey Rublev as the four-times Grand Slam champion continues to struggle with illness, the Spaniard's coach Juan Carlos Ferrero said.

In the ATP Finals’ Day 2, there was a shocking surprise. Carlos Alcaraz was defeated by Casper Ruud in the first match of the 'John Newcombe group', creating a situation that no one would have expected before the start of the tournament.

Carlos Alcaraz struggled with a stomach issue and looked far from the player who won two Grand Slams this year in losing to Casper Ruud 6-1, 7-5 at the ATP F