Magüi Serna
María Luisa Serna Barrera is a former tennis player from Spain.
She started competing in ITF Challengers as from 1993, and joined the WTA Tour in 1996. On 12 January 2004, she reached her career-high singles ranking of world No. 19.
Serna produced an upset by defeating Justine Henin in the 2001 Scottsdale tournament, 7–6, 7–6.
WTA career finals
Singles: 6 (3–3)
| Result | W-L | Date | Tournament | Surface | Opponent | Score |
| Loss | 0–1 | Apr 2001 | Porto, Portugal | Clay |  Arantxa Sánchez Vicario | 3–6, 1–6 |
| Loss | 0–2 | Jun 2001 | Eastbourne, United Kingdom | Grass |  Lindsay Davenport | 2–6, 0–6 |
| Loss | 0–3 | Apr 2002 | Porto, Portugal | Clay | Ángeles Montolio | 1–6, 6–2, 5–7 |
| Win | 1–3 | Apr 2002 | Estoril, Portugal | Clay |  Anca Barna | 6–4, 6–2 |
| Win | 2–3 | Apr 2003 | Estoril, Portugal | Clay | Julia Schruff | 6–4, 6–1 |
| Win | 3–3 | Apr 2003 | Budapest, Hungary | Clay |  Alicia Molik | 3–6, 7–5, 6–4 |