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Tennis stars Novak Djokovic and Rafael Nadal have been warned by John McEnroe that world No. 2 Daniil Medvedev may 'do something big' at this year's French Open. Medvedev has enjoyed a perfect start to his week at Roland Garros, winning his round one and two clashes in straight sets.

Heading into the tournament plenty of talk surrounded the likes of world No. 1 Djokovic and French Open specialist Nadal. 1984 champion McEnroe though believes Medvedev could be set for a big tournament, sending a strong warning to the sport's two biggest stars.

Following the Russian star's second round win over Laslo ere McEnroe told Eurosport: "I'm going to talk about Medvedev because I am actually pleasantly surprised. I thought he played really well, and we talked about Medvedev being a hard court player, I think he has got the ability to do something big