Table:
text: 1988–89 Philadelphia Flyers season
Playoffs
Patrick Division Semifinals
Game Date_ Opponent Score Series
1 April 5 @ Washington Capitals 2–3 OT Capitals lead 1–0
2 April 6 @ Washington Capitals 3–2 Series tied 1–1
3 April 8 Washington Capitals 3–4 OT Capitals lead 2–1
4 April 9 Washington Capitals 5–2 Series tied 2–2
5 April 11 @ Washington Capitals 8–5 Flyers lead 3–2
6 April 13 Washington Capitals 4–3 Flyers win 4–2

Question: Which team played in the Patrick Division semifinal playoffs on April 9, 1988–89?