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.

After first-round exits in Dubai and Indian Wells, Novak Djokovic returned to winning ways after beating Australia's Rinky Hijikata 6-0 7-6 (1).

Djokovic made a push on the return at 5-4 and broke his rival at love with a backhand down the line return winner, leveling the overall score and gaining a massive boost. The Spaniard experienced a break in the sixth game of the third set after a wayward backhand.