Quantum Leap was awesome!!!! Loved the old sets and costumes. A more current series, "Cold Case", had a similar theme-switching back and forth from the past to the present.
I watched Turbo Teen as a kid also. Always thought it was kind of silly.
Favorites: S Kuznetsova, M Baghdadis. J Jankovic, Henin, Gonzo, Federer, Nadal, A Sanchez-Vicario, Boris Becker, G Sabatini, A Mauresmo