Coming home earlier than usual from a date with her boyfriend Joe, Daphne tells Frasier, Niles, and Martin that Joe has dumped her. After Frasier talks Niles out of asking Daphne out on the night that she has been dumped Daphne ends meeting a man that night anyway - a man just like Niles.
"Mixed Doubles" is one of the best episodes from the fourth season of Frasier and has one of the most memorable Frasier storylines ever: the Niles clone dating Daphne. Then there is Niles' own trip to the singles bar which is just as funny, featuring Niles squeamishly saying to Roz "well, I'm here - I forgot to gargle, I'm wearing mismatched socks, and I'm so nervous I could wet myself." Hilarious!