John McEnroe: ´In London Raonic and Isner have the chance of a medal´

Even with the withdrawal of defending gold medal champion Rafael Nadal in London 2012, the strong favorites are Roger Federer, Novak Djokovic and Andy Murray. Nevertheless, the loss of one of the big three might actually open a window to some outsiders. In fact, according to John McEnroe, the tournament might hold some pleasant surprises that could come from Milos Raonic and John Isner.

"I think a surprise is possible, especially given the fact that you play the best of three. Isner, I always say, could become a real nightmare for any one of the favorites, especially with this formula of needing only two out of three sets.

Alongside the American, McEnroe can also see the exploits of the talented Milos Raonic.

"He has an incredible serve, but is far behind, especially on grass. However, I think he is more likely to have a good result at the Olympics than in a major tournament and since I consider him to be a possible top 10 talent I would not be surprised if it happened."

If this were to be the case, Raonic would be the first Canadian to win a medal in singles tennis.