Montgomerie is confident he can regain his form
Colin Montgomerie remains bullish about his chances at the US Open despite a slump in form.
The 44-year-old Scot has slipped down to 102nd in the world rankings but told BBC Sport: "I'm going out with the intention of winning the tournament.
"There is no physical or mental reason why I can't win the US Open and I look forward to trying to prove it.
"I should have won that tournament by now. The door has been open and I just haven't been able to walk through it."
The eight-time European number one was referring to his three second-place finishes at the US Open, which is being played at Torrey Pines in San Diego from 12-15 June.
Those came at Oakmont in 1994, Congressional in 1997 and at Winged Foot two years ago when he double-bogeyed the last to finish one shot behind winner Geoff Ogilvy.
"I've been so close," added Montgomerie. "Especially in 2006 when Tiger Woods happened to miss the cut and suddenly there was an opportunity for somebody to walk through his door.
"The opportunity was given to me and I didn't take it.
"That was disappointing. But I like the event. I like the way the USGA set the course up.
"It's very tough and it does take out half the field because they feel it's too difficult and they lose their patience."
Montgomerie did not qualify for this year's Masters due to his poor ranking but goes for his 16th tilt at the US Open thanks to placing in the top 15 money winners on the European Tour last year.
"I wouldn't bother going out there if I thought the best I could finish was fifth," he said.
"There's no way I'm finished yet. I'm still capable of playing on a world stage and I want to get back into the top 25, where I believe I should be.
"I've still got a good five years at the top in me."