Novak Djokovic feels he made a crucial breakthrough by beating Roger Federer to win the Montreal Masters.
Djokovic beat the world's top three in consecutive matches
The 20-year-old Serb rose to third in the world rankings after posting his first win over the world number one following four defeats.
"I showed my quality. I deserve to be here now. It was very important for me to beat Federer," said Djokovic, now one of the favourites for the US Open.
"I can say that now I have a little bit different picture about everything."
Djokovic has long been tipped as a star of the future but he broke new ground by beating the world's top three players at the same tournament.
The Serb beat Andy Roddick, Rafael Nadal and then Federer to become the first player to achieve the feat since Boris Becker in 1994.
Victory over Federer saw him overtake Roddick in the rankings.
Djokovic is also the first player to beat Nadal and Federer in the same tournament in the period those two players have occupied the top two positions in the rankings.
Federer, who suffered his fourth final defeat of the year, said he expected Djokovic to be a force at the US Open, which begins on 28 August.
"If he keeps this up, he's going to create some chances at the Grand Slams because he's already been able to make the semi-finals at the French Open and Wimbledon," said the defending US Open champion.
"This might be a breakthrough tournament for him."
Djokovic is definitely a contender to win a Grand Slam
Tennis legend Bjorn Borg believes it is only a matter of time before Djokovic wins his first major title.
"Djokovic is definitely a contender to win a Grand Slam," said the 11-times Grand Slam champion, who is now back in action on the BlackRock Tour of Champions and attempting to qualify for the end-of-season finale at London's Albert Hall.
"He has proved he can beat anyone on the tour. He's still very young, but he's going to be really up there with Federer and Nadal.
"He's a great player, he has a great game and he can play on all kinds of surfaces. He did well at Wimbledon this year, he can do well at the US Open, but I think he's going to do even better at the Grand Slam tournaments next year."
Djokovic will attempt to win back-to-back Masters tournament when he heads to Cincinatti where he will face Carlos Moya or David Nalbandian in his first match.