Four-time Grand Slam champion Carlos Alcaraz says he was unaware there would be a class-action lawsuit filed in U.S. federal court against some of the groups that run tennis and made clear that he does not back the effort by the players' association co-founded by Novak Djokovic.

Carlos Alcaraz has said that he doesn’t support legal action launched by the Professional Tennis Players’ Association (PTPA) against the sport’s tours and governing bodies earlier this week.

World number three Carlos Alcaraz says he does not support the legal action being taken against tennis' governing bodies by the players' union co-founded by Novak Djokovic.

Carlos Alcaraz fell 5-7 6-4 6-3 to Belgian David Goffin in the Miami Open second round on Friday while Novak Djokovic tied Rafa Nadal for most ATP Masters 1000 match wins and Russia's Mirra Andreeva took another step toward a 'Sunshine Double'.

Friday night ended in a shocker at the Miami Open as former champion and No. 2 seeded Spaniard Carlos Alcaraz was ousted 5-7, 6-4, 6-3 by 55 th -ranked and unseeded David Goffin of Belgium.