The phrase "already showcased" is correct and usable in written English.
It can be used to indicate that something has been presented or displayed previously.
Example: "The artist's work has already showcased the beauty of nature in various forms."
Alternatives: "previously displayed" or "already presented".
Lithuania's Ruta Meilutyte, Italy's Stefania Pirozzi and several of the American swimmers, including Missy Franklin and Allison Schmitt, have already showcased patriotically coloured, striped or flag painted nails.
The Disney team had also decided to leave out Buzz Lightyear, the modern spaceman toy in the films, because he was already showcased in an older ride called Astro Blasters.
Although Smith had already showcased his blockbuster charm in Bad Boys and Independence Day, it was his role as a cop turned alien immigration officer in Barry Sonnenfeld's ingenious sci-fi comedy that turned him into a true star.
VAIO Z features the innovative 'sheet battery' already showcased on this year's VAIO S Series.
The Dutch team has already showcased small pieces of artificially grown muscle about 2cm long, 1cm wide and about 1mm thick.
During the CES this year, Toshiba already showcased prototypes of 56-inch and 65-inch naked-eye 3D TVs.
Retailers like Nordstrom, Gap and Bloomingdale's are already showcasing dresses with sleeves on their Web sites.
Nymag.com already showcases the kinds of reviews, commentary and recaps that Vulture.com will host - much of it within a so-called Web vertical that is already called Vulture.
But he makes a valid point that sport already showcases the camaraderie and teamwork that must have been so essential amid the horror of that war to end all wars.
Disney is already showcasing lines of Star Wars merchandise, including a $399 Return of the Jedi poster and a $149 R2-D2 model with a swiveling arm and drinking glasses – both of which you can buy with your Star Wars credit card.
The service is already showcasing some original reporting from Doha, Qatar, and Washington, D.C.
