Rafael Nadal is the top seed for this week's Canadian Masters Series event in Toronto.

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The world's best players are all back in town for the first ATP 1000 tournament of the summer and everyone will have an eye on finding form and scoring some crucial psychological blows ahead of the US Open at the end of the month.

The big news is Nadal's return to the tour after a well-deserved break following a brilliant June in which the Spaniard once again did the French Open-Wimbledon double. He is a former two-time champion of the Canadian Masters, winning in 2005 and 2008 and is hot favourite this week but Nadal is more vulnerable on the North American hard courts than on clay or grass.

Andy Murray is the defending champion, winning a thrilling final against Juan Martin Del Potro last year. Murray came into some form again at Wimbledon and looked fairly good a couple of weeks ago in Los Angeles where he came runner-up.

Roger Federer has made numerous early exits in the Masters Series this year and by his standards his efforts at the French Open and Wimbledon were disastrous with two quarter-final defeats. The Swiss is a two-time winner of this tournament and all eyes will be on whether he can get back to his brilliant best.

The big dark horse this week will be David Nalbandian. The Argentine was in blistering form last week and swept to the Washington title. He could face Robin Soderling in a cracker of a third round match.

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