Quick answer — Miki Matsubara performed 1 anime theme, including "THE WINNER" from Mobile Suit Gundam 0083: Stardust Memory.
Miki Matsubara performed the anime theme songs "THE WINNER" (Mobile Suit Gundam 0083: Stardust Memory).
Miki Matsubara's first listed anime theme is "THE WINNER", the opening of Mobile Suit Gundam 0083: Stardust Memory.