The phrase "a tournament once" is correct and usable in written English.
It can be used to refer to a tournament that occurred at a single point in time or to indicate that something happened during a tournament in the past.
Example: "There was a tournament once where the underdog team surprised everyone by winning the championship."
Alternatives: "a tournament at one time" or "a tournament previously held".
"I arrived at a tournament once and I had half of an 8-iron.
We went to a tournament once and one of our games went to a shoot-out.
Kuehne's blood sugar level dropped so low during a tournament once that her brothers had to carry her into a restaurant.
"I led a tournament once and finished second, so I did O.K. I've never been in this position in a tournament of this stature.
PALM BEACH GARDENS, Fla. — Tiger Woods's decision to play the Honda Classic for the first time since he was a 17-year-old amateur gave instant credibility and increased visibility to a tournament once considered the weak link of the Florida swing.
The hairy Frenchman might be regarded as something of a wild card, but given the responsibility of representing France in a tournament once before, he served up Divine for the Eurovision Song Contest, a chanson that is for my money the best entry the contest has fielded since Abba's Waterloo.
(AP) — Yani Tseng made the mistake of grabbing the trophy before the end of a major tournament once already this year — and lost.
But they are used to being overshadowed by singles players, and they are used to hearing that there are no American men left in a major tournament once all the singles players lose, even if they are still in the doubles.
"We're looking forward to a great tournament once again in South Africa and I believe we still have all the resources that we had - from the volunteers to the facilities themselves".
We will look to sponsor a "Sportsuchtig" softball and/or baseball tournament once a year.
Unlike Boston College, St. John's needs to start making up ground to position itself for the N.C.A.A. tournament, once a foregone conclusion.
