Rafael Nadal's 2018 clay-court season has basically been the same as 2017 so far heading into the French Open, which definitely is a good news for the Spanish player. It means three titles and one quarter-final.
This year on clay so far Nadal lost just one match out of 18 played, but the Sky Sports expert Leif Shiras, a former world No. 31 singles player in the 80s, believes that Nadal may not enter the second Grand Slam of the year in the best condition.
'It's confidence and confidence can be intangible. I think that every tennis player has doubts. Even Roger Federer said 'when you walk on to court there are no guarantees what your game is going to be on that day'.
Once you hit a few balls you find out where it is and make adjustments, but I think even Nadal suffers from that still', Shiras said. At the same time, he is very confident about Alexander Zverev: 'Zverev will take a lot of positives from losing to Rafa.
You learn from losing and I know it's an old saying, but it's true, he's going to take a lot away from this. He learned a lot about himself as a competitor, a lot about himself physically as well, I mean look at this run he's been on.
He'll go into Roland Garros with plenty of belief and plenty of momentum.' ALSO READ: World's Most Famous Athletes: Roger Federer's ranking position revealed .