Table:
text: Manuela Maleeva
Singles (21–5)
Singles (21–5)
Edition Round Date_ Surface Opponent Result_
1987 World Group I QF July 29, 1987 Hard Elizabeth Smylie 6–4, 6–4
1987 World Group I SF July 31, 1987 Hard Chris Evert 2–6, 6–2, 4–6
1989 World Group I R1 October 1, 1989 Hard Kim Il-soon 6–1, 6–0
1989 World Group I R2 October 3, 1989 Hard Mercedes Paz 4–6, 6–1, 6–3
1989 World Group I QF October 5, 1989 Hard Anne Minter 3–6, 6–2, 4–6
↓Representing [[|]]↓ ↓Representing [[|]]↓ ↓Representing [[|]]↓ ↓Representing [[|]]↓ ↓Representing [[|]]↓ ↓Representing [[|]]↓
1991 World Group I R1 July 23, 1991 Hard Mercedes Paz 6–0, 7–6 (7–5)
1991 World Group I R2 July 24, 1991 Hard Li Fang 6–7 (5–7) , 7–5, 6–2

text: Manuela Maleeva
Singles (21–5)
Singles (21–5)
Edition Round Date_ Surface Opponent Result_
1991 World Group I QF July 25, 1991 Hard Jana Novotná 4–6, 4–6
1992 World Group I R1 July 14, 1992 Clay Catarina Lindqvist 6–0, 6–2
1992 World Group I PO July 16, 1992 Clay Anna Smashnova 6–1, 6–0
1992 World Group I PO July 17, 1992 Clay Rossana de los Ríos 6–2, 6–2

Question: When was 1991 world group I's Singles (21-5) with Li Fang's opponent for Manuela Maleeva?