Colin Montgomerie's 500th European Tour event as a professional in Seville this week is also a very important one for two other players in the field.
For Swede Peter Hanson and Dane Anders Hansen the Andalucian Open is their last chance to qualify for the Masters in two weeks' time.
Next Monday's top 50 in the world rankings earn places at Augusta National and Hanson is currently 55th and Hansen 57th. Third place on Sunday would probably do it for them, although they may need second.
At least Hansen, twice a winner of Europe's PGA Championship at Wentworth and also twice a winner in South Africa earlier this year, has experienced Augusta before.
He made his debut there last April and crashed out after rounds of 80 and 75. Nobody needs to tell him how hard the course can play.
For Hanson, though, the chance is one every golfer dreams of and he has been so close that it would be agonising to miss out again.
Last November the 31-year-old finished joint third in the HSBC Champions in Shanghai, just a stroke behind play-off pair Sergio Garcia and Oliver Wilson.
That lifted him from 57th to a best-ever 49th in the world and he was fully aware that at the end of the year the leading 50 earned Masters invitations.
One week later, however, he slipped to 50th, a week after that he was 52nd and he could not make it back up in time.
Now he has one final opportunity and it comes at the same Jose Maria Olazabal-designed Real Club course where he finished joint eighth in the Spanish Open last May.
Irishman Peter Lawrie won his first Tour title that week, while Montgomerie was down in 70th place and on a slide that saw him manage only three top-10 finishes all year, his worst return since his rookie season in 1988.
Now Ryder Cup captain, of course, the 45-year-old Scot is eager to mark his 500th event with a return to form.
Not that it would get him to the Masters. Montgomerie is down at 137th in the world and cannot be sure of playing in any of the majors this year. That has not happened since 1989.
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