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Chess Opening Theory/1. c3/1...c5
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Saragossa Opening
If white plays 2.e4 it is a transposition to the Alapin. You can keep this as unique Saragossa theory by playing 2.d4, but this is also likely to transpose into a London System with c5 and cxd4. This is considered as a bad opening as it hinders white's immediate piece development and is rarely seen in master games. In the Lichess Masters Database this line (1.c3 c5) has only appeared 27 times.
Theory Table
+1.c3 c523Transposition to the Sicilian Alapine4
......
...=d4
cxd4cxd4
d5=e3
Nf6d4
d5⩱Nf3
d5d4⩱...b4⩱
References
Lichess masters database
Kasparov, Garry, & Keene, Raymond 1989 Batsford chess openings 2. ISBN 0-8050-3409-9.
Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. ISBN 1-8574-4221-0.